1991 gmc sierra gas mileage ?????????????????????

Not enough information. Engine size? Transmission? 2WD or 4WD? 1500, 2500 or 3500? Weight? Towing package?

I have an '87 GMC 1500 (V-6) that gets 20 MPG on the highway. I have a 1999 GMC K3500 4x4 (454 cubic inch V-8) that gets 12.
 
Well I have a 93 chevy K1500 (half ton) extended cab 4x4 auto v8 350 TBI and I average 13 mpg on a good day in 2wd. And Im also running 33 inch tires. I also have a fresh tune up and don't do alot of highway driving. So I would say any where from 11 to 15 mpg.
 
gas mileage??
2 wheel drive 5.7 carburator

1991 Sierra no carburetor used unless your have a older engine in there, as for the mileage, depends on your final gear drive in the rear end and if you have manual or automatic transmission.

Wish i can give you more information but, don't have much to go on. :eek:
 


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