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Originally Posted by stillsearching
If your towing 1000lbs and getting 35mpg thats i'm assuming better than any cummins.
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That mileage drop at the time went from 53mpg with an empty car and no trailer and 39mpg with a 10 foot long trailer hooked on 3/4 of the tank of gas and full about half that time.
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Though at 3500lbs thats alot more - it's entirely possible that a cummins wont even feel that and will still pull 20mpg, whereas the v6 pickup will see some strain and maybe only be 20mpg itself. (but with 30% cheaper gasoline instead of diesel) At 5500lbs maybe the v6 pickup will be dropping way down. Or maybe it will be no worse off, mostly being about the aero load?.
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The truck that we have at work has a 5.4L V6 and is towing a 16 foot flat bed trailer that we haul granite on, when the total weight is getting in the 3,500 pound limit then the truck really notices and the mileage drops down to those 8-9mpg figures and even with that truck driving in bad weather with that much weight gets sketchy.
A diesel would be well worth it.