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We rented a f450 uhaul box van with the v10 and loaded it very heavy. 22' full of lots of books, appliances, particle board furniture, etc. That and towed uhauls largest trailer also similarly filled. We didn't get a weight, but I'm sure it was heavy, and those are not great aerodynamically. Anyway we got 12 mpg and I drove 70-75mph because we're were losing daylight. It was passing semis on the passes and able to break the speedlimit uphill, so power was fine. I just doubt the diesel version would have gotten 18 mpg to better the price per mile using less expensive gas. At that time diesel was even more at $5.50 vs $3.30 so 60% more. It would have had to be getting 20 with the diesel but those diesel prices have gotten better. Still they are never going to be just even or $.30 more per gallon like they were 10 years ago.
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