65 is the recommended maximum speed for any ST tire. I try to stick with that, when that is the speed limit, but the max. speed on WVa interstates is 70 mph.....what's a guy to do. I usually drop in behind someone that is traveling 65 in the slow lane, and stay with them.
Slower speeds definitely make a difference with the gas mileage also. And for the most part, slower speeds are just plain safer.....unless you are holding up traffic in the fast lane.
Chap
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