Jump to content

V-6 horrible fuel mileage

pottercon

Recommended Posts

pottercon Enthusiast

pottercon

Posted
Posted

Bought a 2014 v6 Sierra reg cab long bed work truck. Has less than 9000 miles. Bought it to save wear and tear on the big duramax beating around town. Would assume it would get between 18-24 like gm says it should. I have averaged 13.5 mpg on the last four tanks of fuel. I just well be driving a 3/4 6.0... What is everyone else getting in town and or combined?

  • Replies 79
  • Created
  • Last Reply
Luster Senior Enthusiast

Luster

Posted
Posted

My son just bought a 2015 Sierra, V6. He is averaging 20-21 mpg combined city/highway. (Every time I've been in his truck, that's what his "Last 50" is showing).

 

A lot depends on how you drive. I think he drives pretty conservatively, fairly slow acceleration after stops, drives the speed limit, times lights, etc.

 

I know a couple guys that drive aggressively, hard acceleration, speeding, NASCAR style :lol: , etc., and their mileage sucks!

SgtShiv Enthusiast

SgtShiv

Posted
Posted

Stock I was averaging 20-22 combined, I haven't had new tires on long enough to figure out my current average mileage yet. According to the DIC I am still pretty close, but prefer to calculate by hand over several fill ups.

NitroDatsik Senior Enthusiast

NitroDatsik

Posted
Posted

I get 15.5 with a level and 305-55-20. Calculating gallons filled up by how miles on trip. Something ain't right on your truck. Shoot something ain't right In mine. No tune or anything, speedometer is not calibrated for the 33s

 

2014 Silverado 2WT CC Summit White 4.3L V6

DROPKICK Edition

IG: jorge_dropkick_rangel

hurricanoday Enthusiast

hurricanoday

Posted
Posted

isn't around 14 the going rate around town? I know my denali 6.2 will be about 14 till I go on the hwy and then it jumps up real quick, all city would probably be around 14 maybe less. No idea about the v6 but wouldn't expect any of the bigger trucks to get better than 14 around town especially if you have a heavy foot.

 

If you had a 6.0 you would be getting 11 or less imo

fondupot Senior Enthusiast

fondupot

Posted
Posted

What kind of driving do you do? Map out your daily route. See how many miles you go, then also count how many stop lights and stop signs, or turns that require slowing down/accelerating.

 

In my experience, I used to do a 11 mile trip to work, 11 miles home. I could average about 16 mpg in my truck (I have a 5.3). But there were 11 stop signs/stop lights on that route. So it was difficult to maximize gas mileage.

 

13.5 does sound low, but not totally out of the question if you are in heavy stop and go, or floor it every time.

tboat Enthusiast

tboat

Posted
Posted

I have a stock work truck with cover on bed. I get 20 MPG around town and some highway. I get 24-25 MPG on highway driving the speed limit. Truck has 1,000 miles on it. I will say mine idles a little rough when cold. Is anybody else seeing the rough idle?

pottercon Enthusiast

pottercon

Posted
  • Author
Posted

My driving style is the truck is, my ign Start 20 times per day. Mostly all in town small town driving! It's a white V6 long bed so I am not hot roding around, I'm working, making trips to the lumberyard etc. it is not loaded down with weight. I pull a zero turn around for a couple miles on Sunday. Very light trailer!. The first tank of gas that got 13.5 included 140 mile trip on the highway. The last 120 mile trip on the highway I noted 20 miles per gallon on the DIC. A tank of gas many last me two weeks, so that's a lot of taking off from a stop over those two weeks. When got the truck with 7500 miles it showed an average of 14.5, I believe, on the DIC. The truck is a theft recovery, so maybe it's still recovering from having the crap drove out of it!..lol

NitroDatsik Senior Enthusiast

NitroDatsik

Posted
Posted

I do all Highway, 80 miles daily and 15.5 is my average.

 

2014 Silverado 2WT CC Summit White 4.3L V6

DROPKICK Edition

IG: jorge_dropkick_rangel

Spurshot Senior Enthusiast

Spurshot

Posted
Posted

I think it's your usage rather than something wrong.

 

Take it on a little road trip to see.

tnchevy Senior Enthusiast

tnchevy

Posted
Posted

I agree, take it on a 4 lane road with a 55 mph speed limit for 50 miles or so and see what you get. My 5.3 ext cab actually does worse around town than my 2002 4.8 liter with 4.10 gears but I still get around 15 mpg. On a 55 mph road I usually get around 20 mpg (my old truck got 18 mpg).

Luster Senior Enthusiast

Luster

Posted
Posted

I think it's your usage rather than something wrong.

 

 

 

I agree 100%. Lots of short trips, town driving, frequent stops, stop signs.... all will kill gas mileage.

 

As others have suggested, do a 50 mile highway trip at 65mph, and I will add this... Use the cruise control. You should be between 22-24 under those circumstances.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • carkhz316
      2006 Silverado HVAC sensor location in dashboard

      By carkhz316 · Posted

      Oh yes, someone is going to be certainly hitting up GM service/ support for a 20 year old truck.
    • Deadwood
      primary drive belt tensioner

      By Deadwood · Posted

      I bought belts and pulleys for my '20 L5P at Rock Auto a couple years ago. I have used them for many years, and almost always save significant money, especially when I buy maintenance stuff ahead of time.   They carry many OEM parts, which is all I use unless an aftermarket is shown to be same/superior, or if it is an insignificant part or unavailable OEM part anywhere else. RA is usually lower priced, often by a bunch, but parts are sometimes unavailable or out of stock, and I do shop around and sometimes find better prices at other sites.   Be aware that you pay shipping, and if you buy multiple items and they are coming from different warehouses, the shipping can kill the advantage. Planning ahead is best if possible.   If you have a transmission service in the near future, check out their OEM (AC Delco ULV) fluid, usually MUCH less than anywhere else.
    • Deadwood
      10L1000 anyone with High Mileage ? I hate Damocles....

      By Deadwood · Posted

      New member here, very long time occasional guest. Saw this thread, thought it would be a good time to contribute someting. It is only my experience and not a claim that everyone will have the same.   I bought my '20 3500 L5P new and have put 99.9% (literally) of it's current ~400k miles on it myself, with over 50% of that towing loads between 4k to 15k, and to me this truck has been nothing short of amazing. For the first 235k I had zero issues, and from there until 321k I replaced a NOx sensor, two failing glow plugs, and three of the notorious injector connectors. I believe this truck is in part, a testament to good luck, but also good care and following a decent maintenance schedule (I also keep meticulous records.) As a result, it looks as good as a well cared for 70k rig, up and down, inside and out.   At some point before that 321k mile mark I began to get a little spooked about the 10L1000, especially the valve body. Word of mouth about potential issues prompted me to jump on the net to sift through all the noise and determine what all the fuss was about. I routinely take long trips, coast-to-coast and points in between, so roadside breakdowns can be '...a thousand miles from nowhere' and a bit of a challenge, and though I had no issues, my guard was up and activated.   And then I stumbled across a chance to salvage some parts off a new 2025 that had been wrecked in transport. I grabbed a few wear items (alternator, pulleys, etc.) and on a whim asked what the ten speeder would cost me. It was cheap...really cheap. I knew some changes had been made in the '24+ version 10L and were supposedly not compatible, but I called service/parts at my local Chevy dealer and asked why and they didn't know. A call to a well known aftermarket transmission outfit revealed it was very likely it would be fine, but to them not 100% sure.   Because it was cheap (really cheap) and I was spooked, I took the chance. Had it installed by a local shop and it worked like a champ, shifted just like the original. At it's first service at 37k, I had the shop put in a Next Gen valve body kit, which after some initial hiccups and rough shifts, smoothed out though with somewhat firmer shifting.   All that said, I have a very serious concern about my newer transmission as just two weeks ago it suddenly began to exhibit a strong reluctance to engage forward or reverse. It was a bit past due anyway so I took it in for service. The reason it was sticking was due to 'glitter' in the fluid clogging the filter...not good folks, often indicates a converter giving out. We ended up going ahead with the new filter and fluid, first to see if it would move and shift, and then if so buy me a little time. It did, and I've driven it over a thousand miles and it is shifting smooth, no noises or slipping. Regardless, it looks like a third gearbox is in my future so I can resume taking long trips with some confidence. In the very short term, my curiosity will have me examining the fluid to check how much glitter has reappeared.   An earlier poster had alleged, in the context of 10L100 failures, that it is another example of how we seasoned citizens somehow descend into hysteria, lose control of our senses, and react irrationally after brief encounters with the idiocy of the internet infosphere. Let me say (and I have used and abused said internet since it's infancy) there is no segment of the populace that has a corner on over-reaction to digital garbage. Just as my offering of experience in this arena is purely anecdotal and should not be considered gospel or all-encompassing, I believe it is still worthwhile information to consider, along with other relevant anecdotal experiences about things like complex transmissions, especially when balanced with other sources.   So to answer the original question, yes I got high miles out of my first 10L, trouble free for 321,000. Now I really wonder how much longer it would have went. Did I 'overreact' to the internet ghouls by replacing a 'good' one with a 'bad' one? Maybe. Who knows, the thing might have taken a puke a 100 miles later. So I'll just fix it again, then move on and start thinking about all the other stuff that will eventually wear out. It still has the original brakes (they're at ~60%), original injectors/pump, turbo, water pump, etc....pretty much original everything. Knock on wood.
    • swathdiver
      6 Speed vs 8 Speed

      By swathdiver · Posted

      At peak temperature.  They get to cool down and warm up more, especially those with the external cooler.  I have three GMT900s and one of them has over 225K on its original transmission.  Fluid gets changed about every 36K miles, all of it.     It's not the bean counters, it was the government.  They had to meet CAFE standards and other government requirements.   To get around that, we tune them and modify them to our liking.
    • GMCustomerService
      Will not stay in Reverse

      By GMCustomerService · Posted

      Our customers' safety isn't something we take lightly. To ensure you get the proper assistance for your truck's repairs, please fill out the form at https://s.chevy.com/support-request with all pertinent details including your username.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...