Quote:
Originally Posted by RobertSmalls
Different tires have dramatically different rolling and aero characteristics. Tire selection WILL have a huge impact on your fuel economy, with knobby tractor tires probably delivering the worst economy, and slick big rig tires probably being the best. YMMV, HTH.
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That makes sense, but what about if his truck had an extra axle and two more wheels?
Intuitively (if they were just two more of the same type of wheels) the RR would go up 50%, but he'd get 50% more traction for braking and cornering. I don't think extra traction for acceleration would help in this case.
But if he got tires that were 25% narrower (but silmilair tread and compound) his RR would be about the same, except he'd be spreading the total trucks weight across six wheels (and bearings) for some type of RR reduction?
I'm guessing it wouldn't be worth the cost, weight and work. But anything to get the RR down seems like it would be beneifical for mpg for such a heavy vehicle. I've been searching the web-but have found no real credible info so far.