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I tested this once. 70 mph at a 2-second following distance was about the same as 65 driving solo. 60 was even better, and 55 and 50 even better still.
Drive solo. Don't draft. Besides the safety aspect, it doesn't gain you THAT much.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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