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I was traveling with my son in law following for 3 hours on the highway and I picked up 2 mpg from what we had averaged the week before with nobody consistantly following. He wasn't that close, but my daughter told him a few times to back off so he was closer then 2 secs.
In stock car racing everybody gets their drag reduced, frobt, middle, back. On the highway it's not going to be as drastic but now I'm happy to see a follower.
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