Milage on 250 SuperDuty with new Diesel ??? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

RustyOne · 12-10-2007, 16:30

What is the common fuel mileage with the new twin turbo Super Duty 250..
You would think this is a new generation motor and would get better mileage then the older versions...mine get 12mpg at best... Is this common, if so shame on Ford..

senix · 12-21-2007, 13:41

I don't have one yet. I have a 06 with the 5.4. Have been reading alot bout the new diesel.

I think and what I know about the diesel is it takes about 10-15 k before it gets broken in good.

After about the 500 mile mark (break-in period) if you start working that motor that will help. city driving hurts it.

**360ci** · 12-30-2007, 20:56

Once you factor in a curb weight of 7000lbs, a 350hp diesel engine with twin turbos, 12mpg doesn't sound too bad. I still don't think anything compares (durability wise) with the old 7.3L V8. After 5000miles, mileage will start to improve, as with any engine. Once the piston rings get seated properly you'll see an improvement.

bkmurray98 · 01-01-2008, 17:37

12 mpg sounds pretty good.my brother bought one he has 25000 miles one his and he gets 8mpg at best

rsford · 01-05-2008, 15:34

ya considering it being new and not broken in with twin turbos. Id be happy with 12. expect a couple more after its broken in and the weather gets warmer.

wwb · 01-07-2008, 10:56

I don't know for sure, but I would expect it to be very close to what the 6.0 does.

Your mileage will be heavily influenced by your driving style (how heavy is your right foot?), whether you drive mostly highway or city, your tire pressure and tire size, your axle ratio, and your transmission (not much difference in town, but on the highway, a manual will beat an automatic by 1 to 1-1/2 mpg).

My '06 F250 with a 3.73 axle and a 6-speed Manual trans gets about 20 mpg on the highway in the summer, as long as I keep it under 70 mph (with 265/70R17 tires at 65 psi). In town, it's about 17.

In the winter, it's about 17.5 on the highway and 14 around town. That's with a winter fuel blend and 285/70R17 tires at 55 psi.

**360ci** · 01-07-2008, 11:04

Also, with a manual trans connected to the diesel, you can get better mileage (when not towing) if you keep the rpms around 1000rpm, as you have more than enough oomph at that speed to get you moving. Just gotta watch the rpm however so it doesn't lug - transmissions don't like that. On the highway you can get a Gear Vendors under/overdrive transmissions the most awarded auxiliary transmissions. gear splitter to add an additional overdrive which lowers your rpm by 20%!