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I experimented with some close (<1 sec) tractor drafting last month on two separate occasions for over an hour. Safety concerns aside, it's not difficult from a purely technical aspect, but from my tank calculations (no Scanguage), <1 second drafting at 60-65 mph doesn't provide appreciably better mileage--at least on my Taurus--than does cruising at 50 mph. In fact, I suspect the extra heft needed to maintain the draft canceled out the resistance benefits. When you add the safety considerations mentioned in this thread, it doesn't seem worth it. I won't be doing it again. Long drives are much more enjoyable when I'm not constantly matching my speed to that of a vehicle ahead of me.
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