Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Tall tire test (taller gearing advantage offset by wider, heavier wheels/tires?)

SentraSE-R · 06-20-2011, 02:46 PM

I'm impressed with how consistent the data are. Usually there's more variability, forcing me to say there's no significant difference between tests. I was so tired from the five tire swaps, I just drove my test laps and logged the data, so it was almost like blind testing. The first chance I had to analyze those data came as I wrote my report. The data look good, and consistent. While there still may be no significant differences in 1 mpg values in yesterday's testing, I'm willing to concede that 2 mpg differences probably are significant. I'm half ready to sell the 17" wheels/tires, or swap them for lightweight 15s. But it's probably not worth the effort for a 4% mpg improvement.

Thanks for your suggestion, CarlosSW. Tire sizes incorporated in results summary.

06-20-2011, 02:46 PM	#60 (permalink)
SentraSE-R Pishtaco Join Date: Jun 2009 Location: Bay Area, California Posts: 1,485 Mean Green Toaster Machine - '06 Scion xB Team Toyota 90 day: 48.92 mpg (US) Thanks: 56 Thanked 286 Times in 181 Posts	I'm impressed with how consistent the data are. Usually there's more variability, forcing me to say there's no significant difference between tests. I was so tired from the five tire swaps, I just drove my test laps and logged the data, so it was almost like blind testing. The first chance I had to analyze those data came as I wrote my report. The data look good, and consistent. While there still may be no significant differences in 1 mpg values in yesterday's testing, I'm willing to concede that 2 mpg differences probably are significant. I'm half ready to sell the 17" wheels/tires, or swap them for lightweight 15s. But it's probably not worth the effort for a 4% mpg improvement. Thanks for your suggestion, CarlosSW. Tire sizes incorporated in results summary. __________________ Darrell Boycotting Exxon since 1989, BP since 2010 Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin Mean Green Toaster Machine 49.5 mpg avg over 53,000 miles. 176% of '08 EPA Best flat drive 94.5 mpg for 10.1 mi Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg Last edited by SentraSE-R; 06-20-2011 at 03:00 PM..