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  1. Anyone happen to know how many gallons of gas you have when the gas light comes on? I drive a 99 silverado 1500 5.3L v8.
  2. Is anyone running larger than stock tires on a new 6.6 gas 2500 or 3500? Interested in learning about what kind of hit your mpg took if so, and would love to hear any feedback on your setup.
  3. Hello everyone, Lets get a small thread going on towing MPG. Please show what you towed, rough weight,and maybe a small map of your route. Please also add what you have On a 268.7 mile trip to the lake, i was able to get 13.4MPG. 3/4 highway doing 60-68mph and 1/4 city. Towed just fine for roughly 3500Lbs. TRIM: LT MOTOR: 5.3L DFM TRANS:8-speed 4x4?: 4x4
  4. Hey all, I recently had a 7.5in vertex lift installed on my 2011 Silverado by a very reputable shop. Truck looks awesome but my mpgs took a major hit. Only fill up with premium. I know trucks aren’t known for stellar gas mileage but going from 15/18 to ~11 mpg is a killer. Truck specs: - 5.3L with Diablo afm disabler used to prevent oil consumption (it works). - 18x8.5 in wheels with 275/65 duratracs (nitrogen inflated). 2in spacers all around. - K&N air filter. - new plugs and wires with ~30k miles on them. - flowmaster super 44 dual exhaust. I’ve cleaned the throttle body and MAF. Hooked up my obd II and no codes. Other than removing the lift what can I do? Thanks in advance!
  5. Hello, I’ve got a 2008 GMC Sierra SLT with z71 package. I’ve had it stock until this year (2020). Recently put a level it in and had the truck aligned and it ran great. Went to put new tires and rims which are 33x12.5 Toyo open country AT2 extremes on 18x9 fuel assault wheels. The truck obviously had a decrease in power and mpg but recently it has gotten significantly worse. On HWY I can get 18-16 but recently in the city I am getting 11mpg!!! I live in a city with a lot of hills and windy driving so I can attribute that to some of it but it seems low. I’ve looked around and some guys suggest checking air sensors and tune ups, but I am wondering at what point is it a bigger issue? Or is it the reality of a lifted truck with heavy tires? any suggestions are welcome, it has not been 11mpg for long just the last month. Thanks
  6. Hey All, Just curious what type gas so you all use for these trucks? I'm running 89 but I didn't know if these trucks perform better with one type over the other, any added performance or mpg boost with one? I want to see if I'm wasting the little extra I pay for 89 if 87 is the same thing.
  7. Does the tonneau cover improve gas mileage over not using one? I've seen a few people take off their tailgates for better mpg, does this really work?
  8. Posted in another area but was recommended I post here as well. I didn’t see an option for a 2014 2500 which is why I did not originally But most there are 5.3. Chevy 2014 2500 Crew 4x4 has a 6” lift with 35” tires, Mickey Thompson AT if that matters enough to mention. 4.10. I also carry 2500 pounds of weight on a daily basis. The topper is 8 inches taller than the cab but this was calculated before I installed it. Funny thing is I haven’t noticed much difference even though it’s creating some wind resistance... I’m getting a horrible 8 mpg. Now a 2500 isn’t best in the world to begin with, loaded down with a commercial topper and constant weight was getting 11-12 city with a heavy foot. Trailer 10. And always had 1 to 2 sizes up in tires. 265 was 275 or 285. 275 was always a nice median. But 8 is just crazy land!!! But this is the first time I’ve ever driven a lifted truck with big tires. So first, is this normal? And if it is, is it even worth my time / cost to go down to 34’s? I wouldn’t think so but I also remember going from 285 to 275 and there was a huge difference across the board. Normally I wouldn’t care but I happen to be taking off on a 2 year road trip cross country and I can already feel my budget shrinking
  9. Hey peeps, I have a 15 GMC sierra 1500, it has the max tow package, with a 5.3, 6l80e, and 3.73 gears. What kind of fuel mileage are people getting with the same set up. I have some buddies that have similar rides, both 15 GMC's one has 3.08 gears a 5.3 with a speed and the other is 6.2 and an 8 speed with 3.42 they both get over 24 mpg. Anyone out there getting 19-20 on the highway like mine?
  10. My 2014 2500 Crew 4x4 has a 6” lift with 35” tires, Mickey Thompson AT if that matters enough to mention. 4.10 I’m getting a horrible 8 mpg. Now a 2500 isn’t best in the world to begin with, loaded down with a commercial topper and constant weight was getting 11-12 city with a heavy foot. Trailer 10. And always had 1 to 2 sizes up in tires. 265 was 275 or 285. 275 was always a nice median. But 8 is just crazy land!!! So first, is this normal? And if it is, is it even worth my time / cost to go down to 34’s? I wouldn’t think so but I also remember going from 285 to 275 and there was a huge difference across the board. Normally I wouldn’t care but I happen to be taking off on a 2 year road trip cross country and I can already see my pocketbook being hurt...
  11. I'm looking at a 2015 1500 with a 4.3, 3.42 gears. I would add a leveling kit with 33x12.5s. What should I be expecting for gas mileage? Would a 5.3 get better MPG with the lift/tires? What is your current tire/lift/engine/mpg? I tried the search feature but couldn't find a ton of what I was looking for.
  12. I'm into hypermiling. Most times, my gas mileage is better than EPA's. Rarely, it's not. My 2004 Audi A4's EPA had 30 mpg highway and my average was 36 after over 1,000 miles despite 20% being city. Then it was a new 2008 Benz C300 that supposedly got 26 mpg according to EPA but I could barely get 24 out of it. Tires were properly inflated, but other owners said that it was common. A lousy 177-hp V6! The Audi had 170-hp. I learned not to trust the EPA numbers. I suspect they use soccer moms who keep both feet on both pedals simultaneously. Then I had the new 2012 Ford F-150 4x4 with a 365-hp V8 that got me 22 mpg on the highway, not too bad since EPA's estimate was 19 mpg highway. When I got a new 2016 with the same V-8, with the power slightly increased at 385-hp, my gas mileage average was initially 20, but dropped to 17 after I added a shell on it. I thought a shell would help but a lot of forums didn't agree. I didn't use the computer, I measured the gas since Ford's tend to be around 5% to 8% optimistic while Chevrolet's is usually spot-on (that was what I read and have been told). The 2019 Silverado supposedly has the lowest wind resistance of all the pick-up trucks. EPA numbers show 22 mpg on the highway. My last trip was 28 mpg, not bad for a 355-hp V8. I don't think the engine revs at over 1,500 whilst going 60 mph. I am almost sure I can do better than 28 mpg because about 10 to 20% of that was in stop and go traffic. I am not adding a shell for sure, don't want to mess it up. I thought the Z71 package would make the gas mileage worse with the slightly more aggressive tires since wind resistance is a big factor. Getting 28 surprised me, I'm very happy with the fuel economy. I am old school, am still leery towards small quad-turbo charged engines. I read about owners disabling the troublesome active fuel management which resulted in almost no difference in gas mileage, but since Chevrolet did a lot of quality control on the 2019 dynamic fuel management, I don't expect that to be a problem. Has anybody achieved better gas mileage? No going downhill, just on a flat surface going 60. Just about everybody who doesn't own one or doesn't watch the gas mileage would say a tonneau cover helps, but Mythbusters disagreed, along with several who own trucks with tonneau covers.
  13. 2015 GMC Sierra 1500 SLE 31K miles. So I straight piped my exhaust and deleted the third cat now I get about 9 mpg literally went through half a tank in one day. Can anyone shoot me in the right direction as to why this is! My guess back pressure but I keep reading things that go back and forth about it. Long story short I just bought a new cat and borla atak full system to try and fix this issue. Running 93O
  14. John Goreham Contributing Writer, GM-Trucks.com 7-25-2019 General Motors reported this morning that the all-new Silverado equipped with the 3.0-Liter Duramax diesel engine has earned an EPA-estimated 33 MPG Highway in 2WD configurations. Here is a quick look at the numbers we have so far: 2WD Silverado Duramax = 33 MPG Highway, 23 City 4X4 Silverado Duramax = 29 MPG Highway, 21 City Here are a couple of quick comparisons: 2019 Ford F-150 2WD Diesel = 30 Highway, 22 City 2019 Ford F-150 4WD Diesel = 28 Highway, 22 City 2019 Ram 1500 2WD Diesel = 27 Highway, 20 City 2019 Ram 1500 4WD Diesel = 27 Highway, 19 City **2020 Chevrolet Colorado 2WD DIesel = 30 Highway, 20 City **2020 Chevrolet Colorado 4WD DIesel = 28 Highway, 19 City “We designed the all-new Silverado and the all-new 3.0L Duramax turbo-diesel to deliver both performance and efficiency,” said Tim Herrick, Silverado executive chief engineer. “The engine utilizes state-of-the-art technologies to optimize every drop of fuel, and takes advantage of architectural changes to make Silverado larger, lighter and more aerodynamic than before. The resulting combination offers all of the performance, refinement and capability customers want in a full-size truck, with highway fuel efficiency you would expect from a family sedan.” The trade-off for fuel economy alone will worth calculating. In addition to the higher fuel cost compared to gasoline, for the LTZ and High Country, the 3.0L Diesel is a $2,495 option (identical to that of the 6.2L V-8). For the LT and RST, it is a $3,890 increase over a 2.7L Turbo engine. For those looking for diesel towing capability, the choice will be an easy one. The EPA has not yet published full MPG and emissions information on the new Duramax at its site, www.fueleconomy.gov. Once data is posted we will do a more in-depth post on the comparison to some other Silverado models. First deliveries of the 2020 Silverado with the Duramax engine will be this coming fall.
  15. I have 2019 Silverado 1500LD stock to the bone. If install a cat back exhaust just a simple street 40 series flowmaster or a super10 flowmaster. Will it hurt my MPG? IF so do yall know by how much? I've never owned a truck I've only owned Camaros and Corvettes so this Pickup Ownership is new to me.
  16. I like the fact that my 6.2 has lots of power and actually does get good gas mileage. I can run 65/70 and easily get 23-25mpg. I’m about to upgrade tires and looking for recommendations. I know I’ll lose some mpg and possibly low end power, but I don’t want to turn my beast of a truck into a turd. I currently have stock 275/55r20 (31.9x10.8) on stock “snowflake” rims with Bilstein 2” strut/shock upgrade. 3 tire sizes I’m interested in: 275/60r20 (33x10.8) 285/55r20 (32.3x11.2) 295/55r20 (32.8x11.6) If I had my way, I’d throw a 305/55r20 on there but I know I’d kill my power. I know this because I have 295/55r18 on my Ford and I ended up doing a gear swap from .373 to .456 to bet my power back. I’m in the real estate business. I buy and sell farm and recreational land so I put lots of hwy miles on this GMC yet still need a tire to get me in and out of places on the farm and pull a tractor when I need to. I have trucks to mudbogg in, looking for practicality here. Really hoping to to hear from guys with 6.2s. Thanks in advance.
  17. There are many MPG threads on here and other forums. Some say "If you bought a truck it ain't for MPG's" Of course there are more comments like this but my question is about an often used statement. "Your truck's powertrain is still breaking in and It should continue to improve as time goes on." <- or something similar I'm no rocket surgeon so forgive me for asking. Why is this often used statement used... and is there anything scientific to back it up?
  18. Ok so I've installed the Airaid MIT, AEM dry high flow filter, and Borla muffler. Now I need a tune to bring all this together. I'd love to pay a custom shop to do this professionally, but unfortunately I can't find one near me, which is weird because I live in the freakin racing capitol of the world. I'm looking for a very basic tune. My primary concerns are MPG's, turn off V4, and account for the 33" tires I put on. If I can gain a bit of performance from this tune, awesome, but that is not my primary concern. Anyhow, I've seen a ton of tuners out there from the cheap "plug in and leave" type, to the full blown $500 tuners. So what is everyone's opinion on getting a tune? Is it really all the hype others make it out to be, is it worth it, and is it really necessary with the mods I've done? Will the cheap "plug in and leave" type suffice, or are they junk? Are the $500 tuners worth it, and if so, are they easy enough from a beginner to use (I'm a beginner but I'm also very tech savy)....OR, should I just keep looking for a pro shop to do it for me? Thanks fellas!
  19. So I have a 2018 Silverado 5.3 Z71 LT and I've tried looking up threads for this topic before but for some reason I haven't had any luck. Ive had this truck for a year now and I had a level lift installed and my MPG stayed around 18-22 MPG and I could get 325-400 miles out of a full tank of fuel. I recently installed a 3.5 Rough Country suspension lift and I installed 20" wheels with 33" tires. I knew going into this modification that I would see a slight decrease in MPG but immediately after the install I dropped my MPG to 7.5-9 MPG and I cannot get it to increase AT ALL. I used to work at a GM dealership and spoke to a couple of old co-workers about this issue and for some reason we cannot pinpoint the issue. I know that increasing the ride height and the different wheel/tire package would create a difference but I didn't know that it would be this bad. I'm considering a performance chip and a CAI to try and increase my MPG, and its not a bad batch of gasoline and I've changed my driving habits and kept my foot off the throttle a little bit...if anyone has any info on this it would be greatly appreciated, thanks a lot!!
  20. 2018 Silverado Z71 5.3L with 14K miles. DIC fuel average indicates 10.3% better fuel economy then actual MPG. 28 fill-ups and reset each time. Any way to calibrate meter? 1% variance maximum variance between each of 28 fill-ups. Thanks for any assistance. Truck is 100% stock including tires.
  21. I have a 2001 GMC Sierra with the 5.3 Vortec with about 211K miles. Over the past 5 months or so I've noticed the MPGs have TANKED. Be aware this is a Regular Cab 2WD! Early spring last year I was getting about 15-16 MPG with 75% hilly-city driving. Summer came around, I was still receiving 15-16 MPG. As of today, on my last fill-up I averaged 13.4 MPG. Previous two fill-ups were in the ~14.5 range. I very rarely pass the 2000RPM rev-range. I have a code that pops up every once in a while for a Downstream O2 sensor. I have a pending code for a UPstream O2 sensor. I've heard the Upstream sensors have a large play on MPG? Trucks rear end fluid, engine oil, and transmission fluid were changed May 2018. I also cleaned my Air Filter, MAF and Throttle Body about two days ago to attempt a quick fix. Any tips will help. Things I've also tried: Seafoam (2 weeks ago) runs wayyy better Marvel's mystery oil (mid-summer) did not change at thing...
  22. Hey all I recently went to some 18x12 -24 moto metals with mt Baja Mtz tires and they are measuring out at around 32” from my stock wheels with 265s on my 2016 5.3 6sp cc 3.42gear Mpg went from 21 to 13 avg trans temp up from 188 to 194 constant on highway power feels like my old 4.8 now I got a hypertech 2.0 tuner but no help really I expected possibly a loss of 2-3mpg but this is a little much I had planned to go 6” with 35s but there’s no way now unless these Mickey Thompson’s are causing way to much rolling resistance has anyone else had this big of a lose with mud tires or offset rims ?
  23. John Goreham Contributing Writer, GM-Trucks.com 12-11-2018 Ford's media launch for the all-new 2019 Ranger is presently underway. One tidbit that Ford let out today is that the Ranger will have a 22 MPG Combined rating in 4X4 and 23 MPG combined in RWD versions. Those numbers are the same as the Colorado and Canyon Duramax diesels'. Normally, comparing a gasoline-powered vehicle to a similar one with a diesel engine is meaningless. Diesels are really good at two things; creating torque at low RPMs and having a high miles per gallon rating (of diesel fuel). The Ranger is a bit different. Like the new Chevy 2.7-Liter turbo gas engine, the Ranger's 2.3-liter "EcoBoost" turbocharged gasoline engine also develops outstanding torque at low RPMs. The Ranger is rated at 310 lb-ft of torque. Ford has not yet provided a curve for it and we will update our readers when they do. Expect a low RPM peak and a flat plateau over the entire normal operating speed range of the engine. Diesel is presently selling at 22% more per gallon than regular unleaded according to AAA's daily national average posting. It will be interesting to see how the Ranger pulls trailers. It may well have a similar pulling ability to the Duramax equipped midsize trucks from GM, but offer much quicker acceleration coupled with a lower cost for fuel.
  24. Just a quick question if anyone else has noticed this or had this problem. On my way home on the same highway I always take with the same fuel, load etc.. I noticed on the DIC that my mpg tracker was fluctuating a pretty decent amount. Normally it bounces between 1-2 MPGs at steady highway speed but tonight it had a 5-7 MPG fluctuation. I have a blackbear tune with v4 delete, Cai, oil catch can and Borla cat back exhaust. I didn't notice any surging or pulsation of the rpms gauge and there wasn't any wind at all pushing me around. Kind of confused what's going on here.. 2014 GMC Sierra 5.3L 4wd
  25. Here’s my 2015 Silverado 1500 LTZ 4x4. Got a 6 inch Trailmaster lift with 24 inch replicas and 37 inch rbps. Should I do a gear change? If so, what?
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