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You can try cruising up the hill staying close to 55mph. For my accord, a big hill is usually 20-25 on the TPS reading on my scangauge. Your "big hills" may be steeper though. My Accord is an auto and doesn't downshift until the load goes above 90% as long as I'm not losing speed. So, I'd think 5th gear would be doable up a long hill.
It's gonna feel different than normal though. You'll be trying to hold speed, and not have much ability to accelerate. I can regularly break 45mpg in my Accord, so I'm sure you can whip that!!
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