OK, more details from the trip. As mentioned, this is a 2001 Ford E450 V10, 24' MH, 55gal. gas tank. Left home with a near-full tank. First fill-up near home: 10.4gal @$3.38 = $35.39. Next,38.3gal @ $3.27 = $125.63. Next, 16.4gal @ $3.17=$52.41. Next, 24.6gal @ $3.21=$79.24. Return trip: 39.1 gal.@$3.32=$130.37. Next, 26.8gal @$3.33 = $89.52. Next, 35.2gal @$3.31 = $116.96. Last, near home, 27.7gal @$3.44=$95.59. Including gas near home, total cost of gas for the 1826 mile trip was $725.11. Total gallons used, including sitting and running the generator A LOT for several days = 218.6. So, 1826 miles/218.5gal = 8.356MPG.
Undoubtedly this is mostly a lot of useless information, but it's for those who want a real world look at typical V10 trip costs. And, again, this is on our MH that ended the trip with 195,512 on the odometer.