Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Prius 15's are better than aftermarket 17's! (Wrong wheels/tires can wreck your MPG)

Dave Philips · 10-03-2012, 08:40 PM

I don't see that you've corrected for tire overall rolling diameter between the wheel and tire sizes you are comparing. You may have significant odometer and speedometer error/ changes as a result of the wheel and tire swaps that you should correct for. I agree that a smaller/lighter wheel and tire will often lower rolling resistance. Also, narrower tires probably will have less drag. Tire Rack publishes accurate tire diameters for each tire they sell.

10-03-2012, 08:40 PM	#25 (permalink)
Dave Philips EcoModding Lurker Join Date: Sep 2011 Location: Delmar, New York Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts	Tire diameters I don't see that you've corrected for tire overall rolling diameter between the wheel and tire sizes you are comparing. You may have significant odometer and speedometer error/ changes as a result of the wheel and tire swaps that you should correct for. I agree that a smaller/lighter wheel and tire will often lower rolling resistance. Also, narrower tires probably will have less drag. Tire Rack publishes accurate tire diameters for each tire they sell.