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My door seal or whatever is not tight, and I hear the air whooshing through it when I go fast down the highway. I noticed that sound does not go away until I get very close, probably <20ft, from the truck in front. I'm sure there is some drafting effect if I'm further back, but I really hate that noise so I figured I'd just go as close as possible.
Your idea of switching out of the lane to see how far your speed drops when air resistance comes back is interesting. Can we assume that gasoline burned is constant?
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