9 to 11 with or without trailer. Best ever no trailer 11.01 MPG no generator. Best with 5500 lb open trailer w/generator 10.75 MPG.
Worst is high 9 MPG. I did have down in 8MPG once but was shakedown trip to Disney with lot of time over 80 MPH.
I do usually try to draft off semis or other RVs on longer runs.
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