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Average Gas Mileage Poll

MarkD

By MarkD
in 2000-2014 Silverado HD & Sierra HD

Average Gas Mileage Poll  

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MarkD Senior Enthusiast

MarkD

Posted
Posted
Please post your trucks configuration and mileage.  Is your truck stock?  Comments?  What made the biggest improvement?
4x4man Enthusiast

4x4man

Posted
Posted

Depends...I get 9-10 in town, got almost 14mpg once on the highway and get 6-7mpg towing our 10,000lb 5er.

 

Truck currently is a few miles short of 12,000 miles and is completely stock.  Have thought about getting the Superchips tuner for the mighty 8.1, but it has enough power already, its just a bit thirsty under load.

 

Truck specs in sig.

 

Bob

lauriet1 Enthusiast

lauriet1

Posted
Posted

Stock

12.5 unloaded avg. speed 50mph

8.9 loaded with slide in camper, towing approx. 4000 lbs @ avg. 55 mph

 

Believe it or not I did get 17 mpg once with my slide in, no trailer though at an avg. 68 mph.  I checked the calculator 3 times, couldn't believe it.  Must have had a really good tailwind... :nono:

bummed-n-Md Enthusiast

bummed-n-Md

Posted
Posted

8.1l, 2002 Crew CAb, automatic.  100% stock, short bed.  14500 miles

 

It is my daily 'commuter' (30 miles 1 way).  City or highway, I get about what I expected when I purchased this vehicle, a consistant 12.3 to 12.6 mpg of gas (and of course the unexpected 'normal' 1 qt of oil per 1300 miles! :angry:)  The absolule best I ever got was on one leg of a road trip where I was the 5th car in a 8 vehicle 'convoy'.  I got 13.2 doing 85+ mph (for a whole tank).

 

 

bummed.

8100HD Enthusiast

8100HD

Posted
Posted

01 CC short bed, 3" lift running 295's, Superchips programmer, The Other Guys headers, UPD intake, de-screened mafs, Direct Hits ignition.

Getting 12 mpg @80-85 mph

13-14 mpg @60-65 mph

and 10-11 around town.

No complaints from me specially with a big truck pushing 400 or so ponies. :cheers:

CMNTMXR81 Senior Enthusiast

CMNTMXR81

Posted
Posted

02 HD.  Ext cab, 6.5 bed, 4x4, 8.1 with Allison.

 

So far I have just bolt-ons like Volant intake, custom Magnaflow mufflers and a few "free" mods.  I have my cam in the garage awaiting installation as well as some heads 8.1 heads being worked on now.

 

I posted about 9.5mpg, but that has to do with my heavy left foot.  I race just about anything in the lane next to me and commonly run it up to the 100mph speed limiter.   :cheers:

CMNTMXR81 Senior Enthusiast

CMNTMXR81

Posted
Posted

That doesn't surprise me.  Simple physics really.

 

On paper, the 6000 is smaller therefore should consume less than the 8100.

 

However, in reality, the 6000, being smaller and less powerful, has to to be worked harder to move the same amount of mass as the bigger 8100.

 

THe 6000 does have one positive though, it doesn't have to twist that Allison.

ern New Member

ern

Posted
Posted
Hey, I'm new to this site, and the main reason I joined, was to pick other brains about my truck's mileage. I have a 2001 4x4, ex-cab dually, 8100, Allison, and can't seem to break the 9 M.P.G. barrier! The truck has 6400 miles. Will this get any better? Please say it will, because the Power Stroke is calling my name if something doesn't give!
CMNTMXR81 Senior Enthusiast

CMNTMXR81

Posted
Posted

That's Ok, I don't get too worked up over the 10mpg avg.  I knew when I bought the truck I was buying a truck that weighs 6,260lbs and has a nearly 500 cubic inch mill under the hood and packing 4.10's in the pumpkins, wasn't going to scare Chevy Metro's anytime soon.

 

As a matter of fact, fuel economy ranked about 129th on my list of "important things to consider" when I purchased it.  That's why I can't comprehend why people come asking how bad the mileage is on a 496 cube monster.  What where they expecting to see?  24mpg??   ???

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