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AVERAGE GAS MILEAGE

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Mr. Smith Enthusiast

Mr. Smith

Posted
Posted

97 GMC 5.7 3.42 rear. Stock as GM made it (except for the stainless steel manley valves) Did a valve job at 85K because the heads leaked oil at the drainback holes in the head.Truck has 105K on it. I just recently changed the FPR and fuel pump as it wouldn't hold pressure in the rail.

redchev1 Enthusiast

redchev1

Posted
Posted

99 3/4 ton stock except 2006 3/4 ton aluminum wheels. 22 pounds a piece lighter than stock steal may make a slight difference in mileage and performance.

4.10 gears

265/75R16 tires

5.7 engine

  • 4 weeks later...
921500Z71 Enthusiast

921500Z71

Posted
Posted

I have the old TBI, but I did have a topper on with about 2 and 1/2 sheets of 3/4" 4x8 sheets of plywood with 2x6's and tools so the weight is similar to a burban. 3.73's 265/75/16's and over 200k and I get around 11-12 mostly city. Worst tank ever was 4.4mpg and best was 18.1mpg.

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