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Old 05-20-2011, 05:05 PM   #10 (permalink)
SentraSE-R's Avatar
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)
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That's a possible option - to put taller tires on the stock wheels. 195/65-15s would be 5% taller than stock while only weighing 37 lbs. I'll keep my eyes and ears open for used tires in that size, for a future test.

I don't follow Mark's math. Unsprung weight affects inertia and handling, but I don't see how it equals an 8% increase in the effective weight of my vehicle, nor how that necessarily affects fuel economy. I pulled 48 mpg with 600 lbs of passengers on a 150 mile drive last Fall. The added momentum on downhills pretty much made up for the extra work getting the weight up to speed.

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; 05-20-2011 at 05:47 PM..
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