It would be interesting to see a group of the "best" hypermilers practice driving in a train, maybe with some radios, and see how their mileage could be improved. Only the best racers can draft within inches because when it comes time to hit the brakes, you've all got to be in very good sync. When I take my car to the track there are very few drivers (everyone is ametuer) that I would follow within 5 feet. Some drivers I wouldn't follow within 50 ft (not joking).
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