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I think that your gear ratio will probably have a more significant impact on your gas mileage. We have an older Ram 3500 DRW (2011) have 4.10 rear end. That results in about 14 mpg as a daily driver. The trade off is it pulls our monty like a pack of sled dogs when going through the mountains passes out west.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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