I'm looking at getting a '64 chevy, 250 6cyl, 4 on the floor for going out on weekends and things. I know it won't get great gas mileage but it should be better than my '68 Plymouth with a cammed up 383. What should kind of mpg should it get? I'm not sure about the rear end gear ratio, but I'm guessing its around the upper 3's or low 4's for towing and hauling power. Thanks for any replies.. Created by Scott H. cars-transportation-en - car-makes-en - chevrolet-en

My 1965 C10 w/3 speed manual used to get around 20-22 mpg highway before we tossed the 6 and installed a V8. That's Imperial gallons. Converted to American gallons that's about 18 mpg tops. We guesstimated that it had a 3.73:1 rear axle. We are currently installing a 3.55:1 rear axle for a bit more economy.