I currently have a 2016 F250 gasser. Bought it new off the lot and from day 1 I have avg exactly 10 mpg between towing a trailer and not towing one.. Currently I avg around 8 mpg when towing a 7k lb trailer 3-4 times a week. On the interstate going 65-70, I can get about 16-17 mpg without a trailer.
I have found several 2018-2019 F250 diesels locally with under 20k miles for around $43k.
By going with a diesel, will I see any drastic increase in my MPG or should I just stay in my gasser?
Some folks I have spoken with have tried to steer me away from diesel.. They tell me the maintenance is high, they leak oil, always in the shop etc etc.. I would think this is true for older trucks... But for new ones?
In my opinion and economically speaking, a person needs a diesel when he needs diesel power to get a load down the road and is unable to do that (reasonably) with a gas engine.
Itís really the same reasoning as upgrading from a Ĺ ton to a ĺ to a 1-ton.
I remember the 454 & 460 gasser days and pulling 10,000lb+ steel trailers in the flats and stopping at a lot of gas stations. This was before diesels had turbos, direct injection, etc. At the time, Ford was offering-up their n/a 6.9 IDI producing something like 160-170hp. I would outrun them and out pull them all day long with my big block gassers. With the right engine and truck, there is little doubt gas can handle your work load and the moderate mph difference will simply be reflected in somewhat increased job costs.
If you go with a diesel, it will cost you more money. Conversely, if you go with a diesel, it will pull loads much easier. I have the maintenance & repair files on each truck Iíve owned (mostly diesels) and the increased cost per mile for a diesel (compared to gas) is just a fact and plainly evident. Some newer models are better able to defer that cost which can (temporarily) help with the cash-flow. Some older diesels are (much) worse than others. If you are thinking about a fairly recent 6.7, then youíre ahead in the repair portion but youíre also spending more dollars at the front-end for the purchase cost. The good news is that if you are upgrading trucks because you plan to haul more weight in the future, then you should be making more money and that justifies and pays for the diesel truck upgrade cost (and larger water trailer). The downside of course is that ďtransportation costsĒ is always located on the expense side of the ledger Ė the cheaper you can keep it, the more money in your pocket.
If you can skate along for a few more years and the new Ford 7.3 gasser proves-out, I would suggest picking-up a used one as a compromise. It sounds like it is custom made for applications such as yours.
Good luck whichever way you go Ė