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We get a little over 7 while towing our dolly (2014 F53 V10 22K GVWR under a 2015 Hurricane 34E - 5 speed). I cruise at about 63-65. I also use tow haul mode which seems to help with how it handled up grades (less premature down shifting). Also, coming up to steep grades, I bring the speed way down so I am not cranking at 5K RPM trying to maintain 60. It really is about how you drive it, and where you are driving. But flat level driving, you should be getting 7ish assuming you are not running genset.
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