MPG drop

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Oct 31, 2008 | 09:45 AM

QUINCE

Thread Starter

Mountain Pass

Joined: Apr 2007

Posts: 106

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From: NE Ohio

MPG drop

F350 2007 manual transmission. Last year I was getting 17 MPG. Now at 20000 miles I get about 13MPG empty, 9 or 10MPG with a 14-15000lb trailer. I take it easy, shift before 2000RPM by the book. My trips are mostly 25 miles one way. Changed the oil every 5000mi, air filter clean, no water in the fuel system, never left the gas tank go below half. Is this MPG normal? Could it be a problem with the programming? I am inclined to buy an SCT from Innovative Diesel or to try that Eefuel that’s supposed to completely burn the fuel. I’ll appreciate any advice / suggestions.
Thanks

Oct 31, 2008 | 11:19 AM

Dean88

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Joined: Jun 2007

Posts: 2,621

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From: Sweetwater Texas

Do you have any fuel leaks?? Extra black smoke?

Oct 31, 2008 | 11:48 AM

QUINCE

Thread Starter

Mountain Pass

Joined: Apr 2007

Posts: 106

Likes: 0

From: NE Ohio

None. The poor mileage is the only problem.

Oct 31, 2008 | 12:27 PM

mndiesel

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Joined: Jan 2007

Posts: 3,418

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From: Circle Pines

Was this during the summer or in the last couple weeks. Some places here have winter fuel in the tanks already and that will drop the mileage some.

Oct 31, 2008 | 12:36 PM

QUINCE

Thread Starter

Mountain Pass

Joined: Apr 2007

Posts: 106

Likes: 0

From: NE Ohio

It started during the summer. However, for the last 2 mo I did pull 15K lb 5 days/week with 9-10 MPG. I stopped doing that now and I was expecting my mileage to go back to 15-17 or so. I am still at 13 after 3 weeks or 5 fill-ups.

Oct 31, 2008 | 07:23 PM

A. Michael Foxtrot

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Joined: Jul 2004

Posts: 745

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From: Rochester, NY

Are you going by the computer's MPG calculator or is this hand calculated mileage? If you are going by the computer, it's gonna take a while for it to come back to "normal" The computer calculates your avg. consumption over a course of 1000 miles or so. It's not an instantaneous reading. Try resetting the MPG calculator and see what it reads then.

Nov 1, 2008 | 06:10 PM

QUINCE

Thread Starter

Mountain Pass

Joined: Apr 2007

Posts: 106

Likes: 0

From: NE Ohio

I have the basic truck, no computer, no power......., just the 4x4 and manual air.

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Nov 6, 2008 | 09:53 PM

05chop

Elder User

Joined: Aug 2007

Posts: 502

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Most of the time low mpg means injector problems if you have good filters,fuel,A/A holds air.Need to see if you have any check engine light codes pulled from memory.Lets us know!