No I wouldn't be using super big tires, just something big enough to not look stupid. Unfortunately the old Detroit diesels didn't have monstrous torque... Only about 250 but that comes on at about 2k rpm I believe. I'm just wondering if there were any mods such as intakes, headers, exhausts, etc. that could boost the power and mpg a little. I drive pretty laid back and coast a lot anyways so that might help mileage a little
I'm not expecting it to be extremely efficient. I just want a cool truck that gets decent mileage despite its size, aero, and weight.