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Originally Posted by duncii
I try to drive to maximize economy. Makes me scratch my head too. I log every tank. I would not set speed control to 63 and jack rabbit starts, that wouldn't make sense. Most of my mileage is logged from Fl on interstates to CO & UT. Mostly It's pretty simple. Pull off Interstate fill up get back on Interstate drive 300 miles at 63. Repeat. Have never gotten the mileage others are claiming.
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Do you have a diesel generator, and do you run it while driving?
That’s one item that can lower MPG. Even with a running generator I’m not sure it should lower MPG that much.
Your motorhome is also a bit taller than many Sprinter Class C, so that doesn’t help.