Oh -- now I see what you mean about rolling resistance going up more slowly with the increase from 45 to 55 MPH. It isn't a cube relationship. Looks almost linear. Still that factor is small compared to wind resistance and so the picture is still pretty glum.
BTW, at what tire pressure are you making the roll-down measurements? You can PM me if you like.
Last edited by jime57; 11-11-2011 at 04:14 PM..
Reason: addition
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