1985 gmc swb 305/700R MPG

[Tom]

Originally Posted by Jake Wade

If you say yours gets that, then I have to believe you. I have never personally heard or experienced that kind of MPG from that particular truck, 19-20 tops with 16-17 being the norm.

Same engine converted to RPM intake, eddy 600cfm carb, ramhorn 2" manifolds and MSD Hei distributor with a 200-4R and 3.07 rear gears in my 79 never got better then 15mpg and that truck is at least 1000lbs lighter then my 98. Over the years I've learned some trucks just got the magic combo of tolerances from the factory to get great mileage and I finally found one.