Mods to improve MPG...
#16
My dads 05 F350 6.0L/auto has the same problem with fuel mileage. Running empty down the highway he only gets 13 mpg towing 14,000lbs (either his 5th wheel camper or S250 Bobcat on our gooseneck) he get 11.5-12mpg. His truck is back to being bone stock, he had the Edge Juice with Attitude but took it out and I am going to list it on Ebay for him, he is going to get some custom tunes from Innovative Diesel next.
He has had the truck to the dealership 4-5 times about the fuel mileage, they have reflashed the PCM, they have replaced all the filters a couple of times. They even replace a couple a injectors that weren't putting out full capacity.
Dad is very unhappy with the mileage of this truck, especially since his old truck (same exact configuration only a 99 7.3L/6spd) would get 16-17 mpg without a problem and had a high of 20/21 mpg a couple of times, towing he would get 12-13 mpg.
Dad has actually talked about trading this truck in on a GMC/duramax or Dodge/Cummins, since thet seem to be getting alot better mileage.
He has had the truck to the dealership 4-5 times about the fuel mileage, they have reflashed the PCM, they have replaced all the filters a couple of times. They even replace a couple a injectors that weren't putting out full capacity.
Dad is very unhappy with the mileage of this truck, especially since his old truck (same exact configuration only a 99 7.3L/6spd) would get 16-17 mpg without a problem and had a high of 20/21 mpg a couple of times, towing he would get 12-13 mpg.
Dad has actually talked about trading this truck in on a GMC/duramax or Dodge/Cummins, since thet seem to be getting alot better mileage.
#17
My dads 05 F350 6.0L/auto has the same problem with fuel mileage. Running empty down the highway he only gets 13 mpg towing 14,000lbs (either his 5th wheel camper or S250 Bobcat on our gooseneck) he get 11.5-12mpg
#18
Originally Posted by nvrenuff
13 is low being empty, but I would like to know how he gets 11.5-12 pulling 14k lbs. I get about 8.5-10mpg pulling my 5th wheel which weighs about 8500lbs loaded. Empty I get anywhere between 13-17 depending on city/highway and which tune I am running.
The only reason that I can think of that he gets that good of mileage towing, is that he only does 60 mph, or 65 if he is really pushing it. Also I figure the reason that he gets alittle beter mileage while towing the gooseneck is because of less drag than the 5th wheel. Another strange thing is that with the pick-up camper on his truck the mileage is basically the same as with the 5th wheel in tow. The frontal area is about the same with the pick-up camper and the 5th wheel, but the 5er weighs about 10000 lbs more.
We have no idea what is going on with the mileage, why its so good towing, but just sucks being empty. And no one else can give us a good answer either, we have post about this a few times on thedieselstop.com, thedieselgarage.com, and I may have even asked on here. Also the diesel master tech at the dealership is stumped about it.
#19
#20