Our previous motorhome was a Winnebago Rialta, similar to what you have pictured but a B+ layout. It was powered by a Volkswagen VR6 with front wheel drive and required premium fuel. It had a gross vehicle weight of just over 7000 lbs. and got 15-18 mpg.
We replaced it with a 2017 Thor Compass TB on the Ford Transit 350 HD TurboDiesel chassis. It is just under 24ft. long and a little narrower than most class C's. It has a bedroom slide which allows us to leave the bed made and just fold the bottom up when the slide is retracted. It has a roomy dry bath and a tankless water heater that allows for long showers when connected to water and sewer. With a gross vehicle weight of just over 12,000 lbs. we find it very easy to stay within load limits. It is small enough that we can drive and park it nearly anywhere yet roomy enough that we don't mind spending a couple months on the road in it. The 5 cylinder turbodiesel with the 6 speed transmission has plenty of power and happily cruises all day at 65 to 70 mph regardless of terrain. The best part is after 48,000 miles we have enjoyed a fuel mileage average of 16-1/2 mpg, and have seen tank returns as high as 18 mpg. If one looks at the price of diesel compared to premium gasoline this motorhome is more economic than our Rialta was even with 5000 lbs. more gross vehicle weight.
__________________
|