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Thanks Carlos, and thanks to this forum for all the motivation and great ideas. I did some math on fuel savings with the smooth wheel covers based on the 4.6% figure, and I figure at $3.75/gal, they pay for themselves pretty quickly even if you buy the retail-priced ones at Rocky Mountain Wheel for about $80/4. I did a spreadsheet that calculates the benefit of those covers and the (assumed 2.5% based on a conservative estimate from another user online and below Goodyear's optimistic 4% mileage increase) tires over the 65k tread life of the tires. The combined increase of both makes them almost free, and the covers will outlast the tires and give more benefit for the $.
Only downside is that I curbed the nice stainless smoothie wheel covers for the first time today, and there's a small scratch and dent on one - they stick out a little from the tire. Have to be a little more careful there.
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