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Old 01-01-2012, 08:38 PM   #2 (permalink)
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I don't know about official testing, but I know that when I follow people on the interstate instead of passing, I get better gas mileage. When I am passing people, my rpm's go up and my fuel consumption goes up. I wonder if it creates a vortex because of the continued disruption in air. Sort of a aerodynamic tunnel?
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