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I don't recall ever seeing a Dodge van style box truck with diesel engine, which means your comment is a bit odd.buy a dodge!
Surprised you see so much difference loaded vs empty. I do not see that with my Cummins. I get 13 empty and 12 loaded. Even loaded heavy and pulling a trailer I still get 11 to 11.5. 19 sounds very good to me, I'm surprised. I think you must have a more favorable gear ratio than I do, that may also explain the difference loaded vs empty. Are you able to get into high gear loaded?that gets 19 mpg empty but gets 12 to 13 mpg hauling a 7x16 enclosed trailer
I presume you left out the word "open" before "trailer" in your first sentence ? The interesting thing about enclosed trailers or box trucks is that since the mpg reduction is mostly due to wind resistance, adding extra weight often gives no penality at all on the mpg. In fact I noticed a phenomen where the weight seemed to *add* to mpg on my enclosed trailer...in the mountains. Only thing I could figure is going up the hill was still mostly wind resistance, but going down there was some enertia benefits with the weight in the trailer.One point to look at is that a trailer provides little wind resistance...just whatever's on it...so you fight the wind only 1 way.
With the box truck, you fight the wind loaded or unloaded (both ways on a round-trip).
Not talking about loaded vs unloaded in that case, as the trailer is under 3,500 lbs (i.e. neglible for that truck) but rather a major difference in wind resistances.Surprised you see so much difference loaded vs empty
I dont have any info to base it on, but usually the differances in the 350 to 450 to 550 have been the final drive ratios. I am not really up on modern Ford products(more of a GM person) but I would guess that the 450 is one lower than the 350. The 350 has 370 (?) the 450 may have 411 or 463, maybe the 550 a 488? How rare is the cutaway van with diesel most seem to be gas, not that I pay a lot of attention to them...My F350 has the "higher" gear ratio but presumed that same ratio would be common in E450..is it not ?
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