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It's not the cruise doing that, it's the combination of load and road grade. It takes more power to go uphill for anything you drive. The overdrive is only really for flat land cruising especially when close to the tow vehicles limit. Mountains and headwinds hurt EVERYONES mpg even ours. Just a part of the cost of RVing. Shame we can't be going down hill or with a tailwind all the time, sigh. :)
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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