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I too used to race bicycles competativly, and woudl do this on a semi normal occasion, and many times behind someone driving my car, its called motor pacing, and its awesome. Although, i kinda have to disagree with their reason why fuel economy droped when they went within 6 in. I believe it is more from the air coming from below the truck. When riding my bike, i could definatly tell a difference when getting behind a truck, when you got too close it did get harder. But with a lower vehicle, like my volvo station wagon, the closer the better. And yes i would get within inches of the bumper, even taped it a few times when going 45+ mph (talk about scary).
Either way, economy or not, i choose not to do this, not for the danger factor or getting in a accident, but more cause trucks throw up rocks pretty regularly, and well, i dont mind it hitting me while on my bike, but i dont want it to land a nice ding in my paint, or crack in my windshield. So i stay as far away from Big Wheels as possible.
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