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Could be due to a number of factors to include ambient temp and road temp, but when I change out the stock 18's on both my X and GMC Sierra to aftermarket 20's in the summer I actually get about 2-4 mpg better in both vehicles. Not only are the wheels taller but the tires that I use in the summer are wider as well.
Just my personal experience.
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2011 X5 35i Space Gray/Black Nevada Leather w Dark Bamboo Trim
Convenience Pkg/Running Boards/Cold Weather Pkg/Comfort Access
3rd Row Seating/20% Tint/Style 215 wrapped with Toyo Proxes ST II/ LUX v4
2001 X5 4.4i TiAG/Grey Leather-Retired
djbock's Custom X Page!
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03-12-2009, 10:41 AM
Hybrid Mode
