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Old 10-10-2011, 12:03 AM   #2 (permalink)
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Join Date: Feb 2011
Location: USA
Posts: 346

Canyon - '07 GMC Canyon 2wd regular cab
90 day: 24.95 mpg (US)
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I'm going with the Potenzas for a few reasons.

I know that tire pressure increases help rr with diminishing returns, and 51 is already pretty high.

Secondly, I think CapriRacer said that wider can be better for rr: Barry's Tire Tech, rolling resistance part 2

I'm also assuming that the donut spare is built heavy-duty, and that you won't be going fast enough for the improved aero of the skinnier tire to matter much.

But now you got me curious.
EcoDriving: Turning more fuel into usable forward motion.
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