Poor Fuel Mileage - Ford Powerstroke Diesel Forum
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Old 10-22-2010, 11:12 PM
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Poor Fuel Mileage

I have an '06 f-250 and am consistently only getting 11.5 mpg. No warning lights, no excessive smoke, motor runs strong and sounds normal. What could be the problem or problems? Please help-love the truck, hate the mpg!
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Old 10-22-2010, 11:16 PM
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Is that hand calculated? Or from the computer?

How do you drive the truck? In town? Highway?

Truck set up?......... Reg, super, crew cab? Long, short bed? single, dual rear wheel? Utility bed? weight? rear end gears?



Ehhhh - F250! so it's a singlerearwheel. other questions still stand!

Last edited by 07OUTLAW; 10-22-2010 at 11:30 PM.
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Old 10-23-2010, 12:04 AM
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When was your last fuel filter/oil change?
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Old 10-23-2010, 10:12 AM
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I always use a calculator. The mileage is for city/hwy. My driving style is easy until somebody slows me down (or pisses me off). Its a crew cab, long bed, 4x4, 35 in. tires, about 400 lbs of tools and toolbox, 5" exhaust, Banks cool air intake, SCT tuner (nothing wild), last fuel filter/oil change was about 2k ago.
Sometimes I do pull a utility trailer (up to 4K lbs)

Love the truck-hate the mpg!
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Old 10-23-2010, 10:48 AM
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Hmm. Similar setup to mine, except I'm shortbed and stock 34" tires.

What tune(s) do you run? Have you tried running the truck stock for a tank of fuel? Results?

Where do you live?

When you fill up do you completely top off the tank (to where you can see the fuel)?

Sorry for all the questions and no amswers. I'm not sure what could be going on with your truck. Just trying to rule out simple stuff.
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Old 10-23-2010, 03:36 PM
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Usually program a mileage tune which adds 100hp. We're in SoCal. I've tried the stock tune with about the same results.
When I fill up I fill till it clicks off by itself.
I don't mind the questions at all-it may bring out something I haven't thought of.

Love the truck-hate the mpg.
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Old 10-23-2010, 04:38 PM
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FWIW, I get the best MPG with my "race", or highest HP tunes (I use Matt's SRL, Eric's Xstreet, and Vivian's Looney on a regular basis).

If you're still using the "canned" programs, the ones that came already on the tuner, I'd suggest giving custom tuning a try. The difference will suprise you.

I'd also suggest filling the tank ALL the way. You'll be able to get an extra 5-7 gallons in after the pump clicks off (unless the harpoon mod has been done ). More than anything this will provide consistency with your MPG calculations, you'll know the fuel level is the same every time you fill.
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Old 10-23-2010, 05:06 PM
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Quote:
Originally Posted by Hey Joe! View Post
I always use a calculator. The mileage is for city/hwy. My driving style is easy until somebody slows me down (or pisses me off). Its a crew cab, long bed, 4x4, 35 in. tires, about 400 lbs of tools and toolbox, 5" exhaust, Banks cool air intake, SCT tuner (nothing wild), last fuel filter/oil change was about 2k ago.
Sometimes I do pull a utility trailer (up to 4K lbs)

Love the truck-hate the mpg!
How do you figure the miles run on a given tank of fuel? Do you take the time to fill it all the way up the spout when checking mileage?
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