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Old 09-02-2012, 05:30 PM   #12 (permalink)
2000mc
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
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Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
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capriracer- on the rolling resistance coefficient chart you have on Barry's Tire Tech it seems generally, taller and wider is better.
however the exact order that the 14" tires in sizes i might switch to seems inconsistent 185/75, 185/70, 195/70, 185/65, 175/65, 175/70. i have 175/70-14 tires.

195/70 out performed by a 185/70, 175/70 outperformed by 175/65, and 215/75 outperformed by a 3 sizes smaller tire 185/75.

do you think that overall rule of thumb, wider, taller is better works, and the specific tires used caused this? or do you think that there are certain sizes that cause an inherent disadvantage somehow?
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