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Oh, about people following helping your mileage...
By having a car behind you, it cuts down on the air vacuum created when there is nothing behind you. It essentially cuts down on one of the two sources of that kind of drag. That's kind of how I understand it from the little bit of reading I've done on the subject.
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"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."
- General George S. Patton, Jr
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