Quote:
Originally Posted by nothermark
I think you have it. I forget where it crosses over but by the time we get those boxes up into the 55 + mph range the biggest problem is pushing the air out of the way. That way with a lot more slippery vehicles too.
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Yeah just running some numbers through a online calculator seems to confirm it, drag coefficient and frontal area have the biggest effects in the 65mph range, weight less so.
You can mess with them here and see, I made some educated guesses on engine efficiency and drag coefficient:
Aerodynamic & rolling resistance, power & MPG calculator
Looks to be about an 80/20 split on air vs rolling resistance at highway speeds.