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Avalanche Gas Mileage

scottm

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EDZ Z71 Enthusiast

EDZ Z71

Posted
Posted

I see that the new Avalanche has a 31 gallon fuel tank. I was just wondering how often I am going to be filling this thing up. What kind of gas mileage are you guys getting and what gears does your truck have?

 

Thanks for any help you guys can be.

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

i have heard this many times from people who have a Z71 av with 3.73 rear end

 

13 city

17 highway

 

seems to be the avg

chevy4x4trucks Senior Enthusiast

chevy4x4trucks

Posted
Posted

I don't have an avalanche, but I've got a silverado w/ the 4.8 and a 26 gallon fuel tank.  Just so long as I don't have to do a bunch of runs for work in my truck I can go about 2 maybe even 3 weeks between fill ups.  I'm running premium w/ injector cleaner every month.  I have the 3.73 gears.  I guess it's all relative to driving conditions.  If you pound the gas pedal you won't get that great of mielage.  I suggest doing some performance mods too, because a lot of them will give you better mpg's.  Also, Tires and tire pressure can make a difference.

scottm Enthusiast

scottm

Posted
  • Author
Posted

My milleage has been 16.5 to 20, I have 7000 miles on it now of mostly highway driving.  3.73 ratio in the Z71.

Greg Senior Enthusiast

Greg

Posted
Posted

Did my first fill-up on the way home tonight:  just over 20 MPG with 3.73, std. 16 inch wheels, no mods (yet), and mostly highway driving.  I keep finding myself trending towards 80 on the freeway when the traffic clears - gotta watch that.

Bear Enthusiast

Bear

Posted
Posted

Well, I seem to be getting the low end of that.... My mileage is running just under 13.  Z71 with the 3.73 rearend.  The lowest I have had is 11.5.  According the the hour and mileage figures I am running at about 26mph average which I am sure explains it (coming up on 3000 miles).

 

Bear

Shaners Senior Enthusiast

Shaners

Posted
Posted

Bear,  I think you figured out your own problem.  That is a big and heavy truck, and it takes alot of gas to drive them in traffic and short trips.  I bet if you took her out on the highway for a weekend trip, you'd be amazed at the mpg's you'd get!!!  ;)

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