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Regarding P&G at different speeds, I still have an improvement of 2-3MPG doing P&G at higher speeds over non-P&G. This is all highway, with little traffic volume. I usually am pulsing to 75 and gliding to 65 (sometimes 60). DWL, pulsing as I crest a hill and gliding down. I know I would do better at lower speeds, but can't go slower without being a hazard.
Anyway, my experience is that P&G still helps at higher speeds vs. no P&G at the same general highway speeds.
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