I have had two class c's since 2009. Both had ford engines. The gasser was the V-10, the diesel was the new ford 300hp V-8. The gasser was a 32 foot Jayco. The diesel is a 35 foot Four Winds. The gasser got 6 to 6.5, and the heavier diesel gets close to 10. I drive the speed limit, so both were pushed pretty hard. This was when towing. Driver fatigue is considerably less with the diesel as you can power up most hills without a lot of downshifting. I would never go back to gas after comparing the two.
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