I am looking at getting a 2024 F250 Lariat Crew Cab with 160" WB, The Non H.O. 6.7L Diesel and a 3.31 Locking Rear Axel. I tow a 26' enclosed car hauler that weighs in at 12k constantly with my 2018 F150 with the 3.5L with 3.55 Rear-End and it does the job but not well (start ups from stopping and hills are the challenge). I know that the F250 will pull with out an issue but I also do alot of driving without the trailer too 400 mile trips or more at times. I under stand that the F250 has a smaller fuel tank than the 36Gal in my F150 but when I am not pulling I can get 700 miles or more on a tank full. What kind of mileage does the Non H.O. 6.7L pull with the 3.31 Rear? I plan on driving it from Ohio to Florida and Colorado without the trailer but will be possibly towing something back.

 

I just took delivery of my 24 F250 with 7.3 Godzilla super crew. I flew to KC and drove it home 500+ miles. I was able to set the cruise at 65-68 for the first leg and the onboard showed me 15.0. I filled it up and did a quick calculation and it was very close to accurate. If I drove 70+, I was showing about 14.2-14.5. Since returning home and driving a little around town, it shows 13-13.5. I have a 34' travel trailer, and we have a trip planned in a few weeks. I'll be very happy if I get anything over 8 when towing. I too left an F150 with the 3.5 which had a 36-gallon tank but this one has a 34 so it won't be a huge difference.

 

I bought a new 2024 F250 Xl with the 7.3. I was very disappointed with the gas mileage and the options, 8 miles per gallon pulling my camper. I just traded it in for a 2023 f250 XLT with the diesel, I am so happy I got 16 MPG on the way to the dealer with the 7.3 and 25 MPG on the way home with the diesel. I am going to be pulling the camper in a couple days and I cant wait to see how much mileage I get.

 

The poster asked about the diesel engine. The gas engines are made for hauling heavy loads in the bed. Diesels are designed for towing heavy loads. The diesel engines weigh 5 to 6 hundred pounds more than the gas engines. The HO diesel weighs even more. Tow with diesel, haul with gas.

Grnmster...I have the exact 2024 f250 you describe, standard 6.7 diesel, 3.31 rear. I get as much as 24 to 25 mpg on the interstate running 70 or 75, truck only. But when pulling my 8000 lb load, that mileage drops to a little better than half of truck-only mpg. The fuel tank is 34 gallon, just a couple shy of the 36 that is available on the F150 Ecoboost half-ton (I had one of those. It was a good engine and truck when equipped with max-tow and f250 mirrors!). But once you get max-tow and a lariat package on an F150, plus some other options like big tires, skid plates, etc, your truck weight can get up to close to 6400 lbs and you can easily exceed the GVWR of the truck (my GVWR was 7050 lbs) when you add-in the trailer tongue weight plus onboard cargo. In my situation, that alone required a change to the 250 to be legal on the road ref the GVWR.

I went to the 250 for the reasons you describe when comparing to the 150. If you go diesel, change that oil every 5000 miles. And change both fuel filters sooner than recommended, always. Both are easy maintenance items I do for myself. Why pay someone else? Good luck with your hunt for the new truck.