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I have the Yokohama Avid H4S on some 17" HPD Spinout wheels on an 07 Sport AT. I have noticed a reduction of about 1.5mpg in town, but on a trip, it actually seems to have improved about the same. Using my GTech meter, I only recorded a .01 increase in cornering over stock, but the feel is much better. Also, my family has put almost 100,000 miles on Avid H4S tires, never a failure, and really good treadwear. I know that my wheels are different from the HFP rims, but I thought I would share my data with you in case you find it useful.
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