I did a pretty thorough tall tire test 2 years ago with my xB. 17" wheels/tires that were 12 lbs. heavier on each corner fared worst in testing against lighter similar diameter and shorter diameter tires. The difference was 0.3-3.7 mpg with cruise control at 35 mph, 1.2-3.2 mpg with 25-40 mph P&G, and 1.5-2.4 mpg at 55 mph highway cruising.
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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
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