Like the other posts say, NO comparison a gas to a diesel. I have had both and the diesel rules as far as power and longevity. As far as miles per gallon, the diesel will do better then the V-10. I used to get 8.5 mpg on a V-10 engine. I get the same with my diesel pusher, But every article I read about the FRED it gets real good mileage. I have read as much as 11.5 mpg.
The Fred does not have air ride as far as I know. But the engine will last you three times longer then a gasoline engine.
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2002 Gulf Stream Scenic Cruiser
2018 Buick Envision Essence
Neway Freightliner chassis
Aventa II Blue Ox
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