Quote:
Originally Posted by 68gmsee
I get about 15-16 mpg on my GMC 250 with single barrel and 3.54 rear axle.
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Yeah, that's about right where I am. 250/4 speed. Not real sure about my gears, either, I used to think 3.73, but I think maybe 3.54 seems more realistic with my mileage and the fact that I can do 70+ all day long on the flat.