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I am not trying to build a higher mileage vehicle than a car, just trying to improve what I have to drive now. Trucks being bad to start with, leave a lot of room for improvement, and there are a LOT of them out there. if the truck is geared low 3.73 or 4.10, then any way to get the rpm's lower would be an improvement, depending on engine type and it's torque curve. Years ago, I had a 72 Blazer 4x4 with a low compression 350 and 3.07 gears. I put a 10.25 cr 396 big block in it and with 32 inch tires got almost 18 mpg. The engine was only turning about 2000 at 60 mph. My Cherokee had no lift, 9.50 x 30 tires, 4.0 motor, and automatic.
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