I love my f-250 but not my fuel mileage! It has approx. 115,000 miles, no chip, no major work done to it. I drive a company car all week so I only drive the truck on the weekends and mainly to the deer lease. If I get 250-280 mile to a tank, I'm happy, but then one time it will get 400 (very seldom). I was at a shop yesterday that specialized in 7.3& 6.0's I was talking to a mechanic and he was telling me I needed to bypass the EGR cooler? Any ideas? Thanks

 

There is something else wrong.

First, is there any CEL codes?

Are you operating in "limp" mode?

How many mpg are you talking about? At what speeds? With what load?

 

will the CEL codes throw a light? If so there is no lights on. I'm going to act stupid and tell you that I don't know what "limp mode" is.
as for the mpg's I get a average of 9-10, any speed and loaded or not.

 

I agree with Gearloose. You have another problem that the egr delete won't take care of. If the cooling system is clean, ie;coolant filter, your egr system should function normally.

 

Not always

 

I only get 11 in town empty, that with a 350 CC SRW LB with 3.73 gears. Had the dealer look at it, they said nothing wrong with it. Only have 13K on an 06, i know I need to drive it more to get better mileage.
I have had bedplate problems before, but nothing in over a year now.

 

Miles per tank is really a very poor way of measuring fuel economy. When do you fill up, at empty, at 1/4 tank, or somewhere else? Short box (smaller tank) or long box (larger tank)? There are too many variables.

The only way to properly measure fuel economy is to fill the truck, drive it, fill it again and then calculate the mileage between fills. It also helps to do this across a number of tanks to get a good average.

 

I try to use the same station all the time, which provides the diesel for the buses of 3 casinos in my area, which turns out to be a very high volume station. I have kept all mileage since bought new in 06, average is 12.3. Usually fill up at 1/4 tank and to the same mark on the fill neck.
Everything still stock, not sure why others are around 16-17.

 

A good protocol is to fill the tank "to the brim" just before a moderate length trip (100 miles or so) where you are driving at a steady speed.

It takes a certain patience and a low gpm diesel pump (not the truck pump) to get the fill close to the top --- with experience, you can gauge the fill level readily from when the pump clicks off to how much more it takes to reach a certain fill level while filling slowly.

At the end of the 100 mile, refill to the same level and calculate.

A reasonable mileage is 15-17mpg at 70mph steady cruising, 1,500 rpm, slow gentle starts, no hills, etc. for a 2WD vehicle with stock tires and no "jacked up" suspension.

In town, you are looking at 8 to 12 mpg with short trips, etc.

Towing and the numbers plunge.

Put big tires on it, jack it up, and the numbers plunge more.

 

My 05 4WD Crew Cab averages around 11.5 in town. Daily driver and typical drive per one way trip is between 5 - 10 miles at a time. If I am on the highway at a stead clip, I have seen my numbers climb to the 15 - 17 range. Towing is craptastic at best. Think I get 9 - 10 towing my 10k trailer. That includes a bunch of variables(distance, hills, etc).

My truck is still all stock except for the CAI, which when I get it back from the shop(Turbo issues) will be replaced with the OE one.

 

If you are doing a lot of short trips, a diesel gets crappy mileage until fully warmed up. Trips as short as ten miles will give you a bad average mileage. You can take that to the bank. And after warmed up it takes X amount of miles to start averaging down the mileage average that you got during the warm up.

 

With MBRP 4" exhaust and a Bully Dog Tripple Dog tuner (set to "power" setting), I get 20+ hwy empty running at 74mph, 17 pulling #5000 emclosed trailer at around 65-70mph. The power increase is substantial too, shocking to my buddies who drive it. With just the exhaust (tuner set to stock), I could get 18 empty, 13 towing. Around town numbers don't mean much, since driving styles vary and "town" can mean different things, but I'm never below 17 combined (except when it's plowing season).

One friend with identical truck/setup is getting identical hwy results (don't know about towing).

The truck came with the exhaust so I have no data from before that. I bought the tuner used on ebay for $200-300 (can't remember for sure) to experiment with. I don't think you'd ever get your money back in fuel savings if you paid retail for both an aftermarket exhaust and tuner, but for me, it's worthwhile.

How the higher power setting gets better mileage is a mystery to me.

05 4wd Ex 6.0

 

Most definitely. I wasn't saying mine was bad. Just listing it for comparison and making it clear my trip distance sucks. Also forgot to mention mine is a 350 and not a 250, but that should matter little. I think my mileage issues are a combination of short trips and 4WD height.

 

To Gkurt, I am getting close to your numbers totally stock without taking the chance of the Bullydog trashing my tranny.

 

The only diff. between the 250 and 350 is the spacer blocks on the rear springs. 2 vrs. 4 inches.