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I have read comments on here about the very many reasons to not draft so closely, reaction time, road debris, etc.
Personally, I try to stick to 55 MPH. Sometimes, it is even the speed limit!
However, with my Ultragauge, when I was accelerating on the freeway, I realized that when I accelerate to 70 MPH, my instant MPG goes from 13-19, so at the moment when I shift to neutral, I am achieving city MPG, which is lousy, but I get pretty good mileage coasting 70-50, although I would not argue that it was worth the effort over staying at a steady 55.
I highly recommend Driving with Load. Cruise control is great for level ground, but in an automatic, my transmission downshifts with the slightest incline, and higher revolutions and lower gear are a terrible combination for mileage. I accelerate just hard enough to not downshift, even though I lose some speed.
I pass people if I am stuck behind them for a while and they are driving erratically. I had a van cut me off on my last trip. They seemed to fly over hills, but they kept braking around curves, so I coasted past. I just hate being around people who do not seem to keep a constant speed or have any predictability.
One of the problems is that if you manage to rid yourself of one idiot, sooner or later you will run into another.
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