I recently started drafting semis and trucks and love watching my mpg shoot up! Going 40 mph I was getting 45 mpg (I usually get 38-40 at that speed) behind a truck. And going about 58 mph I was getting 40 mpg (usually 28-32).
I don't know how close I am to the truck, but I don't get any closer to where I can't see the trucks side mirrors, so the driver can see me as well.
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