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Old 02-18-2012, 07:30 PM
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yates367 yates367 is offline
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Mythbusters did this test in one of their shows. They did prove it helps on gas mileage but the problem was you had to be within so many feet to the back of the truck. It was less than a car length. So as stated previously in this thread, it becomes a safety issue as well as possible damage to your vehicle from rocks and what no
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