in my experience with my s10, going from smaller than stock tires to stock size tires paid off big time. granted it isn't 12' tall and 8' wide from the factory but the increase in distance traveled per rpm greatly outweighs the increased drag from vehicle height. that was a 205/60r14 to 205/70r14 (or actual stock 195/75r14)
3 things... 1. off-road lifted trucks usually have body lifts, suspension lifts which increase height but more importantly frontal area (suspension exposed to airstraem more). 2. they usually do engine mods 3. they usually don't get smooth tires, they usually get the knobbiest tires they can afford and drive as fast as they can stand the vibrations
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-Russell
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
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