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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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- - - - -Best 11-mile commute: 105 mpg
- - - - -Best tank: 88.5 mpg / 1133 miles
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