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I've been towing an 18.5K lb. 5th wheel fulltime for 12 years, always with a Ford DRW diesel, currently an F350, 6.7 diesel, 3.55 rear end ratio. I get 9-10 mpg towing, & it pulls with ease up & down mountain roads. On the flats, it runs at 1500 rpm at 60mph. I would never consider a gasser for towing that much weight.
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