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I get 30-31 driving side roads,35-45mph speed limits. I rarely get on the highways. I don't try for mileage on purpose, but I'm a pretty mild driver anyway.
As far as drafting trucks goes, they played with that on mythbusters and came up with some pretty impressive numbers for the follow distance. At 100 feet, about 1 second behind at highways speed, they got an 11% difference.
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