mileage
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
I just don't know.....................
Freshman User
Joined: Jun 2010
Posts: 43
Likes: 0
I would have that rig scanned by a good diesel mechanic with IDS. Something is way of, you are getting worse mileage than my 68 chevelle with a 427.
how often does the truck go into regen? are you gaining oil (diesel fuel in crank case)?
how often does the truck go into regen? are you gaining oil (diesel fuel in crank case)?
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
Havnt checked the oil since my last trip ill check it in the morning and see.
Senior User
Joined: Apr 2009
Posts: 155
Likes: 0
From: Houston
No,hand calculated. LOM shows 23 hwy and 14-16 city. Spartan tuned. I figure I would get higher if I was to put stock wheels back on and ease up on skinny pedal. But I like my 35s and it's hard to let off the skinny pedal when tuned.
Fleet Mechanic
Joined: Oct 2011
Posts: 1,778
Likes: 287
From: Down SOUTH
I NEVER get above 2,000rpm & my truck will only get 16.8mpg running empty interstate driving & hand calculated.
It's completely de-Smogged, 3.73 axle & Stock tires.
I just don't see these 8,500lb 6.4's getting 20+ mpg's
Senior User
Joined: Apr 2009
Posts: 155
Likes: 0
From: Houston
I reset after every fill up. I have not timed when it hits 23 after filling up. But I would estimate 15-30 minutes on highway. That's only when I am traveling. It does not hit 23 driving in city traffic.
Fleet Mechanic
Joined: Oct 2011
Posts: 1,778
Likes: 287
From: Down SOUTH
If you stay on the hwy driving, does it continue to read up around 23 ?
After ive reset mine - it keeps dropping until it gets down under 17 then it stays below 17.
After ive reset mine - it keeps dropping until it gets down under 17 then it stays below 17.
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Cargo Master
Joined: Dec 2003
Posts: 2,022
Likes: 4
From: Redford, Mi.
I actually had mine up around 30 today going down a nice flat section of US23 just south of Ann Arbor Mi. with the cruise set a 68 or so. It's not uncommon to be around 26 or 27.
Haven't checked mileage in a while but it was 17.5 going to work and back, about 40% city, the balance highway. Haven't gone a long distant trip with it yet to check an all highway trip, but I would guess it would be around 21 or 22MPG.
That's with a slightly lighter 2wd deleted truck.
Haven't checked mileage in a while but it was 17.5 going to work and back, about 40% city, the balance highway. Haven't gone a long distant trip with it yet to check an all highway trip, but I would guess it would be around 21 or 22MPG.
That's with a slightly lighter 2wd deleted truck.
Senior User
Joined: Jun 2012
Posts: 370
Likes: 0
From: Central Colorado
My theory on how they can get good mileage is that for the most part the engine is just loafing along at highway speeds when unloaded. When I drive across western Kansas, for example, I never see the rpm's fluctuate, only slight differences in the boost reading.
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Robert6401
1999 - 2003 7.3L Power Stroke Diesel
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Nov 29, 2005 07:39 PM