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Found 18 results

  1. Recently (started three months ago) - I have noticed a sudden loss of fuel economy in my truck. I drive 500 miles a week ALL highway. I have gone through 2 winters on it (bought with 20k miles and now has 70k miles). In september 2016 - I noticed my highway milage dropping. I used to get 21-22mpg on my 170 mile commute (all highway 70mph). It performed like this since I bought. I started seeing 17-18mpg highway, and now I get no better than 15mpg highway. My average over 50k miles driving was 20mpg My average over last 3 months and 4000 miles is 14.5mpg While on the freeway at 70mpg - it gets 14-15mpg. This is very frustrating because for past two months I have been troubleshooting with my dealership. I have extended bumper to bumper and full drivetrain warranty - none of which covers this issue!!! They can't tell me whats wrong with it and seem unable to diagnose the cause. We have tried the following: -Put different stock tires on the vehicle and drove for two weeks, no difference -Put a MAF sensor from a different (new) silverado and drove for two weeks - no difference -Tested for fuel consuption - no excessive use of oil (very little to none being burnt) -Oil changes - no difference -New stock airfilter and clean MAF sensor - no difference -I use only top tier gas and oil -No tire wear visible -Fuel trims appear to be good -No diagnostic codes showing up I know there are many variables for fuel economy, but we have look at everything we could and have ruled out most everything. The dealership is of no help and says GM has no documention on this issue elsewhere. I have talked with many auto professionals and they all say this sounds bizarre or offer up that I have a crap engine. Regardless I have full bumper to bumper/drive train warranty and its of no use!!!! Does anyone offer up what I should take for next steps? I mean, I used to own a 1971 Chevy C10 3 on the tree, that got better mpg than my 2014 Silverado. Its rather unbelievable Where do I go? Who can properly diagnose the issue? Any help appreciated! Thank you! -Darren
  2. Trip B odometer has never been reset. Fuel Economy shown is for life of vehicle. This truck has had significant towing and haven't always been hyper-miling. Still seems like a pretty good LoV FE average. Can any top this? 6.2L 8 Spd.
  3. Life of Vehicle Fuel Economy

  4. Hi, I was wondering if anyone any advise on purchasing the Edge Gas Evolution or the Bullydog GT Gas Platunim for fuel econ increase. When looking at reviews and stuff I've noticed that the bullydog has a higher increase in in MPG but I've been reading that you have to run at least 91 octane. What would be the best purchase here for both fuel econ and overall performance? Thanks!
  5. After searching multiple threads trying to decide what brand of new/used truck to buy I landed at a Silverado because of the range device. My goal was to have a light duty truck that gets around 20 MPG. My mechanic buddies said hell no to the Siverado due to AFM problems. No to Nissan because alot of the stuff under the hood needs the cab of the truck removed to access. No to Ford because it's Ford and I just flat out don't care for a Dodge. So I picked up the new V6 which broke my rule of never buying the first year of a new motor. On slightly hilly and curvy county roads in Mid Missouri I got 21.4 mpg average with v4 activated. I am averaging 19.4 with the Range plugged in. It has yet to run my battery down. Longest without a start would be 3 days. The shift points were definitley smoothed out except first to second going up hill and that doesn't happen all the time. Stock tires also. The reason I didn't do the tune is that I didn't want to take a chance on voiding the warranty by making changes to the computer. Truck had 26,000 miles when purchased. If you get the V6 on a flat highway you could probably jump the MPG up to 21 or higher as I have seen this on short trips. Hope this helps.
  6. Hello all, I am the proud new owner of a 2016 Crimson Red 1500 All Terrain Premium 5.3 (8 speed). This is not only my first "New" vehicle, but it is also my first full size pickup. The truck only has 500 miles at this times, and it is my daily driver here in the Northeast. Thus far I am pleased with the truck, steering is tight, brakes well, the comfort level is great, technology is impressive, and the styling awesome. My only criticisms thus far may be due to my lack of familiarity with GMC trucks, and even my lack of experience with owning a brand new vehicle. First off, and im sure I am going to get beet up over this, but the fuel "economy" is pretty bad. I understand it is a truck and it is new, however with very conservative highway driving and limited city, I am averaging 14-15 mpg (93 octane, New Jersey winter). This is far below advertised or even what most people get with there older trucks. Another thing I noticed is that it lacks throttle response at essentially any speed unless the throttle is mashed. It seems like the transmission is a bit lost and cant choose which of the 8 gears it should be in. At highway speeds, there is really no part throttle acceleration, you really have to get on it for the trans to downshift and make the truck move. This is also my first experience with "cylinder killing" which I am also unsure of. It seems that I only move down to V4 when there is practically no throttle input or if I am traveling downhill. The instant there is a throttle input I am back in V8 and down to 9 mpg to accelerate even on the highway. I assume (hope) that all of these things will sort themselves out as the truck is new, as I have heard there is a period when the truck is in "learn mode". I am unsure if this is correct or how long is stays in the "mode", and more importantly how I should be driving in this "mode". Much of my driving is highway cruise control set, which doesnt really provide much "learning variables". Any suggestions or comments from those who have owned newer generation Sierras would be appreciated.
  7. I own a 2014 Chevy Silverado Double Cab 4x4 Z71 and wanted to share my experience as I approach 30K. When I first bought this truck it was great. I like the features, the ride, very smooth driving characteristics and overall design. Then the recalls started and so far I have had four performed that I know of. I also started noticing some issues that made me feel as if the 10K off MSRP I received was not enough of a discount. Below is recap and assessment of some issues I have seen in the last year and a half of ownership. 1. Paint- too thin and the appearance is blotchy, I am currently having some issues with adhesion as I watch the paint peel off the lower driver and passenger door, this will be covered under the warranty according to the body shop. 2. Recalls- mostly minor but I am sure as time goes on these recalls will increase in severity and inconvenience. GM should extend the bumper to bumper warranty, by a certain amount of time/milage, per recall. 3. Vibrations- there are several issues in this area. Tires are number one in my experience, then the v4 AFM mode and lastly the drivetrain are all sources for these vibrations. But if you look at the numbers on this site and do the math this seems to be an issue that only effects .5%-1% of trucks out there. Even with these statistics in some cases the vibrations have been eleminated. 4. Interior- nice to look at and touch but quality is a C+. Constant snap, crackle, pop, sounds heard mostly caused by thermo expansion and contraction. Then there are the rattles that are caused from cheap clips and loose components. One solution is to take everything apart and use dampening materials (carpet padding/expanding foam/electrical tape) to fill in void spaces and eleminate rattles. 5. Electrical- there are inconsistencies in the way the electronics perform. The radio sometimes emits a static/buzz sound through the speakers when I open the driver door. The bluetooth is temperamental, and the security locking feature sometimes has a delay. 6. Powertrain- GM has some work to do here. From the slip yolk clunk to the G80 rearend backlash knock, this area of the truck needs to be refined and shored up. There was also a leafspring knock that I had to deal with for awhile that I resolved by properly torquing the u-bolts. Even with all this I give this truck a "B-" grade. The 5.3 ecotec MGP along with HP/Torque numbers, the 100k powertrain warranty/36k three year bumper to bumper, and overall performance including towing/hauling make up for some of these issues. I would recommend this vehicle to others but if you are looking take your time and test drive this for a weekend and look for these issues. There are some that are better than others and this is the number one thing when looking at MSRP/resale value.
  8. Any recommendations for aftermarket exhaust for the 5.3l that has the best fuel economy? Also any other suggestions for easy upgrades to increase fuel economy? Thanks, Sam
  9. Cars.com's review this week of the Yukon Denali put the real-world fuel economy in its headline and made it the focus of its review. Should testers of full size trucks and SUVs be surprised by this comparatively excellent mileage, or is this a well-known advantage in the GM truck community?
  10. John Goreham Contributing Writer, GM-Trucks.com 6/19/2015 When we tested the 6.2-liter, V8- equipped Yukon Denali the fuel economy was one of the biggest surprises. Our average in suburban driving rounded to 20 MPG. Our highway mileage was even better. Apparently, we are not alone in finding this one positive aspect of a vehicle with many advantages. Cars.com's review this week of the Yukon Denali put the real-world fuel economy in its headline and made it the focus of its review. Should testers of full size trucks and SUVs be surprised by this comparatively excellent mileage, or is this a well-known advantage in the GM truck community?
  11. Hey guys, got any recommendations for auxiliary gas tanks that are decently priced? Or hell, ways to increase my mileage? I'm getting 11.5mpg right now in my 07 Sierra Classic 2500 with just over 116k and I've got an hour commute to work every day. She's a stock truck running the correct size Kumho Road Venture ATs. Is there any maintenance I should do? It seems like my only option right now is to either get a tank for the bed of the truck, a programmer or sell it and try to get a diesel...or one of them new 5.0 Fords since I hear they can get 20 lol.
  12. Late last night, a GM-Trucks.com member noticed that the 2015 Silverado fuel economy numbers had been updated at fueleconomy.gov. Only available with the 420-horsepower 6.2L V8 engine, GM's new 8-speed will net Silverado and Sierra owners 1-additional MPG in both city and highway driving. We will report on the "official" numbers if and when the company releases them publicly. Compared side by side to the 2014 6-speed View attachment: 2015MPG.jpg(Thanks to gone_fishing for this graphic)
  13. By Zane Merva Executive Editor, GM-Trucks.com 10/13/2014 Despite no official announcement or press release, the official fuel economy figures for GM's new 6.2L & 8-speed transmission seem to finally be out in the open. Late last night, a GM-Trucks.com member noticed that the 2015 Silverado fuel economy numbers had been updated at fueleconomy.gov. Only available with the 420-horsepower 6.2L V8 engine, GM's new 8-speed will net Silverado and Sierra owners 1-additional MPG in both city and highway driving. We will report on the "official" numbers if and when the company releases them publicly. Compared side by side to the 2014 6-speed (Thanks to gone_fishing for this graphic)
  14. 3.6L V6 Chevrolet Colorado & GMC Canyon Fuel Economy 2WD: 18mpg city / 21mpg combined / 26mpg highway 4WD: 17mpg city / 20mpg combined / 24mpg highway “The all-new 2015 GMC Canyon adds segment-leading fuel economy to its winning resume,” said Kenn Bakowski, Canyon marketing manager. “Innovations such as available active grille shutters combine with an aerodynamic design in a smaller, more maneuverable package to set a new standard for fuel economy in midsize trucks.”
  15. By Zane Merva Executive Editor, GM-Trucks.com 9/03/2014 When the 3.6L V6 equipped Colorado and Canyon hit dealers in the next couple of weeks, customers will find fuel economy ratings of up to 26 miles per gallon. Today, General Motors released fuel economy figures for V6 and 6-speed automatic equipped version of the company's new mid-size pickup line. This is the first time the 3.6L has been used in a pickup application and will be rated at 305-horsepower. 2-wheel-drive customers can expect a range of 18-26 miles per gallon and 4-wheel-drive customers can expect 17-24 miles per gallon. Four cylinder and 2016 diesel fuel economy figures will be released at a future date. 3.6L V6 Chevrolet Colorado & GMC Canyon Fuel Economy 2WD: 18mpg city / 21mpg combined / 26mpg highway 4WD: 17mpg city / 20mpg combined / 24mpg highway “The all-new 2015 GMC Canyon adds segment-leading fuel economy to its winning resume,” said Kenn Bakowski, Canyon marketing manager. “Innovations such as available active grille shutters combine with an aerodynamic design in a smaller, more maneuverable package to set a new standard for fuel economy in midsize trucks.”
  16. Hi guys, been enjoying the hell out of my 2014 GMC Sierra 1500 All Terrain but have been pretty disappointed with what I'm seeing for fuel economy numbers. I lurk on these boards quite often, and notice the numbers other folks are getting are always blowing mine out of the water so I'm wondering if I might have an issue. During the winter, I've been consistently getting 10.5 MPG (hand calculated and from the display confirmed)... I was pretty disappointed with that but I figured I'd at least give it until the summer to see if it's just winter fuel. Well in the summer, I haven't gotten over 12 mpg. Most tanks, I'm about 80-85% city driving, so I'm definitely not expecting to be on the high end of the MPG #'s, but this feels way too low for what the truck was rated at. I wanted to get your opinion if you guys think there might be a problem or what I can have a dealer check out (sorry I'm not very experienced with auto repair so I'm hoping to have some knowledge before I have the dealer telling me there's nothing wrong). Here are the details of what I'm driving: 2014 GMC Sierra 1500 SLE All Terrain Dbl Cab 5.3L V8 4x4 3.42 rear diff 20" OEM wheels and tires No lift or level No tune Air Dam still installed Very minimal Idling Minimal weight in the bed w/ tonneau Threw a link to my fuelly page, I've been religious with tracking on that. I feel like this is the only thing so far keeping me from completely loving this truck so I'm hoping there's just an issue that can be resolved. The truck does feel sluggish at times, but not sure if this is a problem or just me being used to a more sensitive gas pedal than these trucks have. Any help or advice you guys might be able to provide would be greatly appreciated.
  17. Whats up guys! I know a little about engines but not enough. I've got a stock 305 from a 1993 Silverado I'm gonna get put in a 1991 Mitsubishi Mighty Max pickup. We are going with carb because the guy doesn't wanna set up the throttle body computer stuff. I'm doing this for two reasons: Fuel economy and Power. Before anyone gets all these ideas why I shouldn't do this, first let me tell you the situation - I bought this truck for a daily driver, its perfect and ideal in every way I can think of as a daily driver truck, exactly what I've been looking for all these years. The problem is, it only gets 1MPG more than a Chevy 454SS. Thats right, only 13MPG. Mechanics around here have looked and say the engine runs excellent, you couldn't ask for a better running engine, but they don't know why the fuel economy is so bad. I don't really know for sure either, but my guess would be that it wasn't set up properly, likely in the computer (its fuel injected, with MAF and TPS and that mess) since it was converted from carb to fuel injected. Whoever done it did a good job, everything looks like its in the factory spot for 93 - 95 models, it just gets awful crappy gas mileage. I've already done months worth of various tests to see if the economy improves, but no luck. Anyway, I'm gonna end up spending more than the truck is worth trying to fix that, so I've decided to take the 305 I've got from the 93 Silverado and get it put in this little Mitsubishi. My installer already said it'd fit, he's a well seasoned mechanic and his brother is a machinist, so I'm confident in the fitment. So here is what I want to know - normally I'm pushing for power as well as fuel economy, but having decided to go with a carb, I figure I'll concentrate on getting the best MPG possible - so then, what kind of carb should I use on this stock 305 (formerly Throttle Body) V8 engine to get the best fuel economy? My installer said the throttle body intake can be made to accept a carb, I don't know how much influence that'd have on what goes on top... Please let me know! Thanks!
  18. Zane & Josh Merva Copyright, GM-Trucks.com A few months ago we gave you our first impressions of the Range, a device designed to enable the active-fuel-management system on your GM 5.3L engine to run more often. Since then we’ve been using the device and recently ran a fuel economy comparison to see how well it works. Since January we’ve been driving our 2011 5.3L Sierra using the Range AFM extender module plugged into our OBDII port. It has made a significant difference in the way our truck drives in nearly all circumstances. We’ve driven over a thousand miles with the device and here’s what we can tell you about our experience with it. First off, the Range does exactly what it states it will do. With the device, our Sierra always tries its hardest to use the active fuel management system (AFM) and engages V4 mode more aggressively than stock. How the device works through the diagnostic port is a little bit of a company secret but the change is entirely reversible, untraceable, and does not damage your engine. When plugged in, the device slightly modifies the signal to your vehicle’s computer, but leaves no lasting changes when unplugged. We’ve long noticed our AFM equipped 5.3L V8 is a fickle beast to keep on four-cylinders, even when we try really hard. The Range “changes” the way AFM works, making it easy to take advantage of the feature. In our experience once AFM is engaged using the Range, the truck fights to stay on four-cylinders through a much wider spectrum of throttle than you’d experience normally. On flat or slightly uphill grades, we could easily keep speed and even accelerate while on four-cylinders using the Range. That’s something we could never do with stock AFM programming. So, while stock AFM always seemed hesitant to stay in four-cylinders, the Range makes our 5.3L act different . With the Range V4 Max, our truck tries to run with four cylinders whenever possible. What makes the Range work, keeping AFM active more often, does come with some minor drawbacks. Most noticeably, the transition between V4 and V8 mode can be harsh and abrupt at times. Where GM engineering designed stock AFM tuning to work smoothly, Range engineers focus on keeping AFM engaged longer for better fuel economy at the expense of refinement. Not surprisingly, in four-cylinder mode our Sierra also felt underpowered. After all, it is running on 1/2 the engine size and longer than GM had intended. On flat roads and highways, that turned out to not be a problem. However, driving with the Range required slightly more mental effort to keep our Sierra moving at speed whenever we drove uphill or through hilly terrain. Whenever we did need extra power,the Range always engaged V8 mode quickly without delay. We also tried towing a small trailer while using the Range but would not recommend it for longer periods of time when engine performance is critical. Heavy loading seems to cause the system to switch between V4 and V8 too often. Thankfully, unplugging the Range while you’re towing is easy. Another oddity was that since it’s always plugged into the vehicle’s diagnostic port, we had false errors show up in our monthly OnStar Vehicle Health Report while using the Range. Most noticeably, OnStar could not read for trouble codes and RemoteLink could not access tire-pressure data. While annoying, there was no damage done and these errors fix themselves when the device is removed. We’re told this is expected behavior, as devices connected to a vehicle’s diagnostic port have the ability to override other vehicle computers. For all the change in the way our Sierra drove, without a daily commute (we work from home), our short and irregular trips around town made it hard to see any direct fuel economy improvement during the winter. While we could always feel the Range working, we quickly realized that through short trips and 4×4 use, our fuel economy actually dropped. Combined with cold temperatures and winter grade gas, the deck was stacked against us getting any real world improvement. We knew that the Range should be producing fuel economy gains but our driving schedule, style, and inclement weather made it impossible to see in hard data. So, as the weather has gotten warmer, we wanted to do a little test. While not scientific, our first idea was to perform a back to back driving loop. We wanted to get an idea of how the Range stacked up to stock, outside of the random short trips and winter driving we had encountered over the last few months. We drove Project Sierra over a predetermined rural and highway road loop to gauge how well the Range worked versus stock AFM programming. Driving the same roads back to back, allowed us to compare fuel economy using the same driver, road conditions, and weather. Both runs started and ended at a gas station so each loop would be tested using the same fuel weight. Our Sierra was also fully warmed up before starting. For consistency, we completed each loop in nearly identical time and average speed, measured via GPS. Through concentration and a little bit of luck, only 50-seconds and 0.6mph differed between the two back to back runs. All effort was made to drive our Sierra in the same manner for each loop. After only 60 miles, the results came out clearer than we expected for an unscientific test. Stock, we completed a 30.8 mile loop in 44:21 minutes at an average speed of 41.64mph. During this loop our Sierra recorded an average fuel economy of 20.9-mpg, as displayed via the driver-information-center. With the Range, our 30.8 mile loop was completed in a comparable 45:10 minutes at an average speed of 40.9mph. With the same driver, same road, and same weather, we saw a DIC reported average of 21.4mpg. That comes to a healthy ½-mpg improvement. Also impressive, considering we’ve never gotten fuel economy that high out of Project Sierra in the past during any time of the year. Until now, our lifetime fuel economy average for our 2011 Sierra has been around 16mpg, as reported by OnStar. During the winter with our short trips and four-wheel-drive use, we often saw that figure dip to 14mpg or worse. While we always caution folks to not rely on driver-information-center fuel economy, a number north of 21mpg is impressive for comparisons sake. So is 30 miles enough to say the Range definitively works? Scientifically, no. However we wanted to see, under a controlled route, if the Range made any improvement at all. Not surprisingly it did. Since our quick loop we’ve burned several tanks of gas with the Range V4 Max and our experience remained consistent. Depending on what type of rear end gears, transmission, and what route you drive, the average driver should see a fuel economy improvement while the device is in use. Since everyone’s driving style is different, it’s hard for us to tell you exactly how much the Range will effect your own fuel economy. Our 6-speed automatic equipped Sierra ran great with the Range V4 Max Module but if you have an older 4-speed automatic, try out the company’s Range V4 Plus module. The V4 Plus is described as better tuned on the highway for vehicles with less transmission gears. Don’t take our word for it, read this thread for other member experiences with the line up of Range Modules. Do you have a Range? Comment and let us know. We want to hear what other Range owners are experiencing. Do you loathe AFM? If you’re looking for the exact opposite effect, disabling AFM entirely, we’ll be testing Range’s V8 only option in the near future. GM-Trucks.com Range V4 Max Hands-On Conclusion The Range does exactly what it claims to but it’s not a magic bullet. Used as a tool, the device allows you to take advantage of your trucks ability to run on fewer cylinders. In our personal experience that can lead to better fuel economy depending on how and where you drive your truck.
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