Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Lower rolling resistance: space saver spare tire donuts @70 psi, or RE92's @ 51 psi?

Kodak · 10-09-2011, 11:03 PM

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.

10-09-2011, 11:03 PM	#2 (permalink)
Kodak Master EcoModder Join Date: Feb 2011 Location: USA Posts: 346 Canyon - '07 GMC Canyon 2wd regular cab 90 day: 24.95 mpg (US) Thanks: 41 Thanked 39 Times in 24 Posts	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.