Bad mpg - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 07-29-2009, 07:10 AM Thread Starter
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Bad mpg

My fuel milage has really dropped of lately. The truck is 4 wheel drive, 4.10 gears, auto trans, stock other than exhust. I read somthing about leaky injectors at one point and I am kind of wondering if that is an issue? The last time I checked it I was down to 12 mpg. I was pulling about 5000 lbs. Empty I am only 13 ish I used to get about 18 empty
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post #2 of 8 Old 07-29-2009, 07:19 AM
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Originally Posted by toad View Post
My fuel milage has really dropped of lately. The truck is 4 wheel drive, 4.10 gears, auto trans, stock other than exhust. I read somthing about leaky injectors at one point and I am kind of wondering if that is an issue? The last time I checked it I was down to 12 mpg. I was pulling about 5000 lbs. Empty I am only 13 ish I used to get about 18 empty
Our local fuel has been crap on and off so maybe that's part of it?

Are you buying fuel from another station now?

Driving a little heavier with the foot?

Is this since you put in the 4.10's?

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post #3 of 8 Old 07-29-2009, 10:16 AM Thread Starter
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Stock 4.10's. I try to keep it just under 70 mph. rpms @ 2200. I don't think my driving style has changed. I have always had a lead foot. I have stayed with the same fuel and I put in some Lucas fuel stuff every tank.
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post #4 of 8 Old 07-29-2009, 12:56 PM
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How old is the air/fuel filters?

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Stormtrooper:: 1997 F-350 CC SRW PSD XLT 4X4: Baby Swamps, Wildman 4 pos chip, 120V IDM, SD Intercooler,BTS E4OD, RSK, CCV mod, shimmed FPR, DIY 6637 air filter, triple pillar pod with Isspro gauges, 4" MBRP exhaust, SD dual tensioner,
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post #5 of 8 Old 07-30-2009, 06:37 AM Thread Starter
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Fuel filter is brand new. Air is ok
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post #6 of 8 Old 07-30-2009, 08:41 AM
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You might check your boost fittings and make sure all the clamps are tight. My dad's NBS 7.3 normally gets around 18 and suddenly it went down drastically and I checked the boost fittings and one was loose. After tightening it up his mpg's are back up again. Just a thought.

My truck:
99.5 F250 4x4 Ex cab long bed
7.3, zf6
Swamps 175/30's
Cales tunes
DIY Intake & Zoodad mod
Muffler Delete
DIY CCV mod
Foil Delete
DIY leveling kit
AIH delete
Autometer Phantom II Boost and Pyro
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Dad's Truck:
2001 F250 4x4 Ex cab short bed
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DIY CCV mod
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post #7 of 8 Old 07-30-2009, 01:18 PM Thread Starter
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I'll ck that tonight. I just bought the 3367 air filter so I can do my own intake tonight.
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post #8 of 8 Old 07-30-2009, 01:19 PM
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yeah, stright pipe it too. and 18 is great for 4.10's, i would love 18. but yes 13 is bad

-Matt

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