i have a E-350 with the 7.3 turbo diesel, that always gets 15-17 mpg 15 is 80mph towing a #7500 trailer terrible aero. 17 is empty trying my best to save fuel.
a 2wd tacoma with 4cyl. is rated for #3500 tow if it has trailer brakes. but with a real load the diesel van is better mpg.
some of the cummins are getting 20+ mpg without trying, and #5500would not overload it. or drop mpg much.
unless you are using it as a daily driver and only occasionally towing, the diesel makes the most sense
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