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If you lower your top speed in your P&G, you will definitley increase your FE. If traffic allows and you don't mind your trip taking more time, I would even lower your max speed to 55 or even 50. Additionally, I have done multiple P&G's on long inclines and it absolutely is more FE in my case. I have also tried to DWL up the long hills but the multiple P&G's always return higher MPGs.
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