Forum Discussion
your a little out in the cost of a diesel. yes they cost 5 to 8K more to buy, but there is less than half the maintenance on them, and the fuel savings alone coverers that if you were disciplined enough to put those penny's away.
for example with my old trailer I had a gasser and I would get about 8mpg towing with it (trailer was 1500 lbs under the capacity of the truck) because you are towing you now go by the "extreme" category in the maintenance schedule. I switched to a 3/4 ton diesel and the only maintenance was filter and fluid changes. yes the oil change was three times the price but it was half the frequency so only a little more expensive, filters cost close to the same, but yes the diesel was a little more in filter costs, not much. the difference is I went from 8 MPG to 18 MPG toing that trailer AND diesel was $0.10/L cheaper than regular gas (37.8 cents a gal cheaper). now, its a little more than gas which is weird. I also do a lot of longer trips, so 1000 miles return with no extra driving but when we go see the older boy that turns into a 2500 mile trip we do ones a year over a couple weeks. so that would have been 312 gal of gas in the old truck in the old diesel it was about 138 gal of gas, plus the diesel was much nicer to drive. so up here out gas (cheapest price from Costco is 3.49 US for a US gal, and diesel is 3.84 US for a US gal. taking todays pricing I would have spent 1089 bucks US for that trip in gas. with the diesel the same trip would cost 530.00 US.
now with campers there is a difference also, not as big, but with my new diesel I get 14mpg (US) towing the 40 foot 5th wheel, with my truck camper in it driving at 65mph on average, am getting 19mpg. if I slow that down to 55 I jump into the 20mpg range. I do have it tuned with emission on tunes which helps, and when I finish the deletes and switch to emission off tunes (because I can do that where I live) I will probably jump 1 or 2 mpg more.
what is really nice is to be able to leave my house heading west. I have a 12 mile grade 8 climb, then I still climb over the next 50 miles, and the truck engine isn't screaming and I can easily maintain the 70mph speed limit if I want. also the convenience of using truck stop and high flow diesel nozzles is nice also. easy as pie when you are towing a trailer.
14 mpg pulling 14k 13’ tall brick and 20mpg with a 4klb 12’ tall brick?
cmon man….Ford should buy that one back from you so they can see what they did to make it get better mpgs than any truck in history!
- StirCrazyNov 05, 2025Moderator
um 3K, 10.5 foot tall brick, get it right . sorry just looked up the camper milage and that one was for a canadain gallon of gas, not your small US gallon 😁so the actual milage was 14.1L/100km which works out to 20 miles per gal Cdn, or 16.7 miles per gal US. but the 5th wheel is bang on, 14mpg US, 16.8 mpg Cdn or 16.8 L/100km. thoes were from this summers trips. part of it is, normaly when I am towing the 5th wheel I am doing 55mph and running the 45hp towing tune. when I am hauling the camper I do 60mph sometimes but normaly 55mph plus I run the 100hp tune when hauling that. I don't know if you have ever hopped up your diesels, but if you did you would know the more you hop them up the better milage they get if you drive it the same.
- Grit_dogNov 07, 2025Navigator III
I’ve tuned a few. Depends on the truck, the year, other mods and the tune.
But you’re getting record setting mileage out of an early 6.7 Scorpion especially with emissions in tact.
55mph does help. But gdamm I’d fall asleeep or go crazy driving that slooooow.- StirCrazyNov 08, 2025Moderator
haha, the speed limit is only 60mph for most of BC (coq is 70) so its not a strech to only do 55 when your twisting around and climbing mountians.
it has always gotten deicent milage stock it got 18.3 mpg (US) going to work and back, my buddies were all averaging about the same. after I tuned it that dropped to 21.3 mpg (US) and when I do the delete I expect about 23MPG or better but thats just guessing. that is driving at 70 Mph to work and back average. I think my best run empty since it was tunes was driving to edmonton and back doing the speed limit and I got 23.5mpg US.
maybe our fuel is just better up here, I know it has more lubracation in it, which is why our cp4 failure rate is the same as england at less than 1% where the failure rate in the US is over 7%.