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I saw several MPG gain going from 45-55 down to 40-55. 55 to 50 drops fairly quick. 50 to 45 takes probably 50-100% longer. 45 to 40 takes probably another 50-100% from 50 to 45! If it's even a tiny downhill slope, I could be going ~43MPH the whole way down! I'm sure every car/road is going to give different result, but I definitely found 15MPH between P+G to be the way to go.
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