MPG getting very bad
Senior User
Joined: Nov 2004
Posts: 352
Likes: 1
I don't know either. It frustrates the heck out of me to see guys getting 15 16 17 mpg and I'm getting 11 and 12. The best I got was on a tank where I took a 300 mile interstate trip....that tank was 14.35. I live in a rural area and most of my driving is short trips on two lane roads...go five miles, stop, go one mile, turn, etc. etc. So it must be the way I drive since my 7.3 didn't do much better. I don't totally flog my truck at every stop, but I don't drive like an old lady either. Hopefully once it is broke in and we're on summer fuel it will get a LITTLE better.
Posting Guru
Joined: Nov 2004
Posts: 1,214
Likes: 0
From: All Over
11-12 around town for a stock truck is awefully low. Thats what I get and I'm lifted 16" with 4.88 gears and 40's.
Make sure you guys are hand calculating your mileage...the overhead is not that accurate.
Make sure you guys are hand calculating your mileage...the overhead is not that accurate.
Senior User
Joined: Dec 2005
Posts: 182
Likes: 0
From: Grand Rapids, MI
I am driving 15 miles oneway to the job site that i am currently at, 50/50 highway/city. over the last month i have averaged 15.7(total miles driven divided by total gallons used) my truck is getting broke-in nicely with 16,500 miles on her
Senior User
Joined: Mar 2007
Posts: 127
Likes: 0
From: NE Ohio
Originally Posted by Bear Hunter
11-12 around town for a stock truck is awefully low. Thats what I get and I'm lifted 16" with 4.88 gears and 40's.
Make sure you guys are hand calculating your mileage...the overhead is not that accurate.
Make sure you guys are hand calculating your mileage...the overhead is not that accurate.
Junior User
Joined: Apr 2004
Posts: 72
Likes: 0
From: Raleigh NC
Its the Chip - Watch for the Head Gasket!!
Stock 13-15 MPG
Hypertech 18-20 MPG
Puking coolant under load to the point that it would empty a properly filled tank in a day.
Getting a head gasket this week. 45k miles. Dealer taking care of repair and provided a Super Duty from local rental company for $75 per day!!
Tech said that MANY 6.0 trucks that tow regularly are needing a head gaskets with and without chips installed.
Hypertech 18-20 MPG
Puking coolant under load to the point that it would empty a properly filled tank in a day.
Getting a head gasket this week. 45k miles. Dealer taking care of repair and provided a Super Duty from local rental company for $75 per day!!
Tech said that MANY 6.0 trucks that tow regularly are needing a head gaskets with and without chips installed.
Senior User
Joined: Oct 2006
Posts: 352
Likes: 0
From: FL
The stock mpg senor on my truck is accually -0.2 mpg off from hand caculated mpg (trip meter mileage div by gallons to full = mpg).
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Senior User
Joined: Jul 2004
Posts: 285
Likes: 0
From: north louisiana
Worst tank I can remember was about 16.0, that was highway and towing, best was 21+(pre-flash of 10/04). Average now is about 17.5, I lost about 0.5mpg with the slightly larger 285/16's. I use a fuel additive every tank, and I run syn oil, tires 5lbs below max., egg under foot method most of the time.
New User
Joined: Dec 2006
Posts: 7
Likes: 0
From: Glens Falls, NY
I have an '06 F350 PSD LWB, 20"wheels and just came back from Myrtle Beach, SC towing a 36' Montana RV. I got around 9 to 9.5 mpg both ways. I get maybe 10.5 without towing anything. I agree this is not good.
Elder User
Joined: Aug 2006
Posts: 501
Likes: 0
From: Eastern Ohio
Yesterday 290miles all highway on my 05 cc 6.0 averaged about 15.5 at 75-80 so probably not all that bad. Best I ever got was with my 35's all highway averaged about 17.5 over a 600 mile trip, no idea how.
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