Exactly. Guys from The Fast Lane Truck had similar results. It would not surprise me at all if a motorhome that size uses close to 1 kWh per mile at “normal” highway speeds.
P.S. — By the way, they seem to have been driving quite slowly to even get the low range they accomplished. I averaged a couple of their segments and they were 46 and 51 MPH. We can see on video how fast other vehicles passed and pulled away. I would not want to drive 50 MPH on an Interstate, even if it were legal.
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