2008 F-450.4x4
Factory tires, 4.30 gears. Full of fuel and with my butt init, 9,400 lbs.

I did the down pipe back delete with Spartan 210 tow tune a while back and never got a chance to get a good check on highway mileage. I was either towing, or doing short hops, which are both mileage killers. After all the above was done towing mileage didnt seem to change, but on my last outing it did appear to be better. I can only chalk that up to the AFE Stage II I installed a couple weeks after all the other stuff. I also have a bed cover on.

Anyway, I put a couple hundred highwya miles on today, with a couple short off highway side trips thrown in, and got 16.44 hand calculated miles per gallon. Pre trip fill up and post trip fill up were at the same pump, and the route out and back was the same. Mph stayed for the most part at 65, only exceeding that a couple times, and briefly. Likewise dropping under that.

When I left the highway the mpg meter was still slowly climbing, but I would expect it to max out fairly quick. Indicated mileage was 19.6 so it's not as far off as some, but it does seem that as real mileage climbs the spread gets widwer. IOW, if real mileage is 14, indicated is about 16.

That is actually better than I could do with my old CC 4x4 v-10 F-250, and even better than I usually do with my V-10 Excursion. Please, no V-10 vs bs, that isn't my point. This is just info.

Anyway, I figure that's not too bad for a big fat pig of a dually and I'm rather pleased.

 

Your truck have the 6.4? That's. Good mpg

 

That's better mileage than any truck I've ever owned. My 250 could pull down maybe 14-15 if I kept to 65, with a 10 yr career best of 18. Go figure on that one. Never came close again and I am almost positive it had something to do with the fuel. In just about every modern-ish truck I've had I've had a tankful that was a flier. I had an late 80's bronco that would generally get in that 14 or so range and on an 850 mile tip I had ONE tank where I pulled in 18.5 hand calculated MPG. Never did it again.

The one exception I had was a 1979 Ford F-150 longbed 4x4 with a 351 automatic. That truck never exceeded 11 mpg. I doubt if it would have gotten better mileage if I put it in neutral and shoved it out of a plane at 80,000 ft.

What I got the other day is pretty good mileage for my truck, no doubt about it, but I also know that it is VERY rpm and boost sensitive when it comes to the mileage. It doesn't take much of a rise in either to start sending that mileage south.

 

I had a '78 250 with the 400 in it before this one. Got a whole 7-8mpg. Unloaded. Made me feel real good about my mpgs when I got the v-10. Of course I woulda been supacool cruisin around with robocop.

 

that is some good mileage with a F450. I can get that or slightly better with my F250 with the DPF still on.