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I'm not sure how honda engines handle hills vs mpg, but mine REALLY drops when going up a hill, something along the lines from 50-55mpg down to 33mpg for an overpass if I try to maintain about the same speed.
If you don't have a scanguage, or some other gauge, get one! From my understanding, for a large hill you will want to load the engine to 80% load which is about the most efficient load you can put on a gas engine. I would play with different methods to find the best one for that hill using a scangauge. If it isn't overly huge, let the car slow down and DWL (drive with load) up the hill. I would assume unless the hill is rather steep, speeding up before the hill is eating more gas than what it is saving you. Go slower up the hill, and faster down the hill (best to EOC if that is an option for you and the hill meets the requirements ex: steep enough).
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