Funny how you guys are talking about 50ft as if it's really close...over here in California if you leave 50ft between you and the next guy there will be 2 people trying to squeeze into that gap. Yes, I'm talking about at 65mph.
When people switch lanes after riding my tail I can usually feel the drag increase, and I can feel the drag difference when someone merges in front of me too. Common experience is to be tailgated on the highway and see my speed go up without moving my foot.
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