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Old 05-23-2009, 06:18 AM   #11 (permalink)
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Originally Posted by Ernie Rogers View Post

Could the difference of-- .009 /.00878 = 1.025-- 2.5% in Crr
be detected with a wheel tire tester? Maybe just barely. Any thoughts from the real world experts here?

Ernie Rogers
Just an anecdote from the trenches:

I know a major vehicle manufacturer refused to accept a tire modification proposed by a major tire manufacturer because the RR increased 3%. That tells me that not only is 3% detectable and reliable, but it also is detectable in the EPA Fuel Economy Test.

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