We just finished a multi-thousand trip around the central and western states. It got HOT, especially in a MH with the majority of the paint black. That said, we ran max dash A/C and the genset to run the roof air on the front unit. It worked but was not as comfortable as I wish we had been. Fuel mileage was satisfactory with an average of 7.5 mpg. I found out the mileage gets better if I let the cruise control work while on the open road. Sweet spot seems to be around 58-62 mph. I was pleased with this.