View Single Post
Old 05-23-2009, 06:18 AM   #11 (permalink)
CapriRacer
Tire Geek
 
CapriRacer's Avatar
 
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 743
Thanks: 1
Thanked 335 Times in 207 Posts
Quote:
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.

  Reply With Quote