The Itasca is on a Sprinter chassis--a Diesel by its very nature its going to get better mileage than the V-10. Not to mention that it is about 1/2 the "size" of the engine in the Ford chassis (Sprinter Diesel is a 3.0L Turbo 6 cylinder vs the 6.8L V-10).
Diesel vs gas, 6 cylinder vs 10 cylinder, 3.0L vs 6.8L all add up to much better mileage.
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