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Two more items I forgot to mention--
1) Best way to lower rolling resistance is cheap--just raise tire pressure. It's perfectly okay to set tire pressure close to the rating on the side of the tire. My tires are rated at 44 psi, and I usually keep them at 40 psi. (But I use 44 psi if I am trying to get spectacular mileage.)
2) If you keep your tire pressure on the high side, you will see that tread wear is greatly reduced. My Michelin Energy tires have a 40,000 mile guarantee (I think) but I can easily get 80,000 miles from a set.
Ernie Rogers
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