The economy can get better.
When I first got my truck in 2006 it had been neglected.
I had to change 3 coils,all the coil wires and the plugs.
The EGR was jammed full of carbon.I guess from cheap gas.
Just changing the EGR helped by 25%
Recently I kept smelling fuel.
Turns out the vapor canister was full or gone bad.
I replaced it ($100) and now the economy has gone back up.
Then it developed a new problem.
It started dumping trans fluid from the front seal.
The local shops say about $600-$1000
That's not even a rebuild just a reseal.
I see new rebuilds starting at 1800$
So I'm gonna do it myself.
Habor Freight sells jacks for about $130 and I have a coupon for 25% off.
The other parts are about 200$
Just hate the grease.
I work on boats and they don't have the grease and road crud.

 

06 V-10 F350 Dually. 75,000 miles. Normal @ 65 = 11.5. Stop & go all around is always 10 ish. Towing heavy (24K lbs.) = 6-7 mpg. RARELY any better than 12 on hwy. unloaded, but it pulls all day long and the most reliable motor I have ever had. I have a VERY hard time believing any claims of hwy mpg over 13.. Guess it is possible, and maybe I need to go thru mine like the post below. Any suggestions would be appreciated.

That being said, I doo want better mpg; have cat back dual exhaust into one, K&N filter, and a power tune. Still looking for that magic mod, and I am leaning towards headers and call it good, this mod was HUGE on my 97 460. Anyone do this ???

 

I also have a V10 dually and I think the dually part has to do with the mpg never better than 11 on highway. But I'm always skeptical too as my 06 5.4 one time got 13-13.5, once. I can see a reg cab 2wd doing it but a crew cab I'm just not so sure. But if people calc it then it is what it is. For the 3 valve motors I think most say stock intake and exhaust are best, meaning that the aftermarket just doesn't improve much and that the oiled K&N's mess with the MAF. Not like the older trucks with bad designs in those areas.

 

2006 dually
430 gears
crew cab
i pull a four place snowmobile trailer w/ a sled in the bed too.
5.8 MPG

 

We have an 01 E350 15 passenger with 96,000 miles. I bought it in New Mexico and on the 1400 mile drive home at mostly 60 mph on 2 lane highways it was right around 15 mpg. We took it on a 2400 mile trip to southern California last spring and loaded with 8 people and gear averaged 13.8 combined. I was plenty fine with that. Towing my rv trailer drops it to 8-9 mpg

 

The best mileage I ever got was going from Augusta GA to Atlanta GA. I never went over 65 mph and got 15 by calculation of how many gal divided by mile driven. I have noticed that if I drive above that the miles start to drop. I am 2wd and 3.73 gears. That being said I live on a military post and the truck is driven stop and go alot to get kids from school and stuff like that so I usually average about 9.5mpg.

 

I live exactly 40 miles from where I work, so 80mi/day usually about 45 minutes, sometimes closer to an hour if traffic is bad. However I work downtown, and would not give up living in a rural area for anything, and well that requires one to drive 40 miles! Been driving my F150 during the winter this year, but since I've owned the F350 I've probably driven it more than the F150.

As far as MPG goes here are what specs I think could be a factor:
09 F350 4x4 CC 8' 6spd 4.10LS 245/75/R17 Stock ContiCraps for most of the mileage all stock truck with heavy service suspension,

no bed cover except occasionally using my wood sides for hauling firewood and other items. Most miles are empty highway. Some hauling 6x10 trailer, firewood, gravel, small boats, garden tractors, etc. About 8,000# max additional weight.

I dont have the chart up to date but here is one from the first ~50 fillups, I record all fillups on my old smartphone in excel:

Green line is what the dash indicates MPG which is always ~.7 higher than it realy is (red one).

Here is the current totals...
Miles: 70152.2
Gallons: 5466.02
AVG Lifetime MPG: 12.83
Thats including everything (cty/hwy/empty/towing/winter/etc).

Far to often people just post "best I ever got was x" which is almost meaningless since its usually a one way trip where wind or elevation was an advantage. What really matters is what you usually get.

My typical drive, unloaded, highway, commuting to work, in the summer I average very close to 14.5 if I can avoid any city or loaded driving and go about the speed limit and accelerate very mildly. Thats calced, dash reads very close to always .7 high (it will say 15.2ish usually) but I have never once hit 15mpg. In the winter the same trip usually averages 13ish or a little less.

My hauling mpg in the 6,000-8,000# range is usually 10-12mpg, although I rarely run a full tank hauling so part of that is unloaded before or after.

I just got new tires last year, with no other changes they can still make a big difference. From the stock conticraps to GY Duratracs I lost a noticeable amount, close to 1mpg, same size. That kind of sucked, but so did sliding all around in the winter on contiskis, and getting stuck on fairly level grass.

 

My 99 F450 4X4 gets 10 mpg empty on rural highways, 7.5 mpg lightly loaded around town (empty weight is 9500 lb), 6 to 7 mpg loaded/working (~15000-19000 lb one way & empty the other way) and about 2-3mpg plowing snow on a good day.

Pretty bad, but considering that I paid $5000 for it with a 9' Boss plow 6 years ago (70K miles) and only drive 1K-2K miles it suits me just fine. Total repairs have been less than $250 over that time, although I should pick up a couple of tires this summer.

The V10 has its place. Driving 20-50K miles per year isn't one i'd recommend though.

 

Dang, that's me.

 

"ContiSkis" lol.

 

I don't feel so bad now. My 2010 V10 36' Class A RV, 13' tall, 20K+ Lbs. plus a 1200 Lbs trailer, I get 8.0 to 8.5 MPG highway. That's with a 5.375 rear end!

 

I am new to this thread and after reading some posts i have some questions on my 2000 F250 V-10. I know the fuel mileage is unheard of with the V-10 but i know i should be getting better mileage then 6-8 mpg no matter what or how i drive the truck. I guess im looking for some help with this, is there something i can do? the truck has 232,000 miles and runs good i just average 130 to 150 miles per tank. Anything would help, thanks

Cliff

 

Get a bigger tank from Transferflow, no more worries.

 

That's me too but I wouldn't drive any other vehicle, especially a diesel like a 6.0 leaker. My V-10 has never left me on the side of the road. Even the new diesels have their own problems. Just look at the difference in TSB's from year to year and you will see that the 6.8 has had the very best record of all the Ford engines. I'll take the "bad" mileage any day over poor reliability.

 

i get 7-7.5 mpg all winter long...a few tanks in the 6's

but luckily i have a 44 gallon tank lol