The Chevy "gets" slightly better mileage because it "gives" slightly less power, the difference on both issues is negligible. If you have any plans to pull a Toad get the V -10 but the Chevy 6.0 will suffice. Unless you are 6' or more the Ford will cause you no grief but as noted they all (Chevy/Ford), vary from year to year.
While my bride makes a lot of trips back into the coach from her navigators seat I rarely do. When we stop I just get out and walk around but can easily access the coach any time I need to (I am 5'9"). The biggest difference between Ford and Chevy are the number of choices available in a Class C. Ford has dominated the Class C market for years and thus there are far more choices that come with the "Blue Oval". Just find the floor plan that works the best without regard for the brand... but don't be surprised if it is a Ford.
:B
