Diesel mpg help
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New User
Joined: Oct 2013
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Diesel mpg help
I am averaging anywhere from 13 to 15 mpg in my 2013 6.7. I know my 33 mud terrain tires don't help but damn. It doesn't matter if my truck is loaded down or empty. Any advice to increase fuel economy would be appreciated
Posting Guru
Joined: Jan 2013
Posts: 1,933
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From: VA
Newer diesels just get crap mileage from the stuff built around them... The emissions components can suck the MPGs right down. Not to mention that new trucks are heavy as heck...
Delete emissions stuff, delete weight, and your MPGs will go up. Maybe look into a tuner.
Delete emissions stuff, delete weight, and your MPGs will go up. Maybe look into a tuner.
Senior User
Joined: Jul 2012
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Where are you located?
If you live in a state that requires a winter fuel blend, your MPG will drop. In every day stop and go driving I average 16.4 MPG. Once winter fuel arrives (it's here now), my MPG drops to 14.3.
If you live in a state that requires a winter fuel blend, your MPG will drop. In every day stop and go driving I average 16.4 MPG. Once winter fuel arrives (it's here now), my MPG drops to 14.3.
Posting Guru
Joined: Jan 2013
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From: VA
Here in VA I'm not sure if we get "winter blended fuel," but my grandfather gets about 14-14.5 no matter what the season with his 6.4. He drives all 55 MPH backroads and highways and some 65 MPH highway. He puts about 40k miles a year on it at this fuel mileage. He doesn't drive it like a grandpa though, haha.
In his 2001 7.3l PSD he got 16.5-17 MPG doing the exact same driving. It's at 300k miles, and still gets that. He got/gets 17.5-18.5 with the same driving in his 1996 7.3l. I drove both of them some recently (business trucks), and got about 18 MPG in the 01 and 19.2 in the 1996 with 330k miles on it. His old 1987 6.9 IDI always made 19+ on tanks of fuel if it was driven empty, but was retired recently at 751K miles.
It seems that these newer diesels just get a little worse fuel mileage.
In his 2001 7.3l PSD he got 16.5-17 MPG doing the exact same driving. It's at 300k miles, and still gets that. He got/gets 17.5-18.5 with the same driving in his 1996 7.3l. I drove both of them some recently (business trucks), and got about 18 MPG in the 01 and 19.2 in the 1996 with 330k miles on it. His old 1987 6.9 IDI always made 19+ on tanks of fuel if it was driven empty, but was retired recently at 751K miles.
It seems that these newer diesels just get a little worse fuel mileage.
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Hotshot
Joined: Nov 2000
Posts: 11,591
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From: Pflugerville, tx
What is the hand calculated mileage? When I deleted on my 08 dually, the dash read 23. The hand calculated was 14.3, up from 13.0
Posting Guru
Joined: Jul 2013
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From: Connecticut
I have found that the hardest thing with mpg is the "lead foot" syndrum. My 2002 7.3 city was 17 and highway was 19-20. But when I would get into it it would drop to 11-13. With the 6.7 I do take it easy and get 17-18 city and 20 highway. Note I do drive an agressive thread tire. 
Mountain Pass
Joined: Feb 2013
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This is what I saw on a single tank earlier this summer. I'm not claiming that this is my avg, just saying its possible with these 6.7's. I regularly get 17-18mpg. There's no way you'll convince me that the newer diesels can't do well on mileage!
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
I have found that the hardest thing with mpg is the "lead foot" syndrum. My 2002 7.3 city was 17 and highway was 19-20. But when I would get into it it would drop to 11-13. With the 6.7 I do take it easy and get 17-18 city and 20 highway. Note I do drive an agressive thread tire.