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Old 04-02-2010, 11:01 PM   #1
300Merc
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7.3 poor fuel economy

so i bought a 99 f250 7.3 recently, and i noticed that i have been only getting 11 or 12 mpg on the highway... the truck is bone stock. so im wondering what could it be? I know that i should change the fuel filter but ive been at school and ive been busy. im off tomorrow and ill probably get one then.. i have those bfg all terrain tires that are pretty far worn and i figured that could also be the problem since they are wide and create alot of rolling resistance. what about an intake or exhaust?
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Old 04-03-2010, 02:25 AM   #2
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Your tires could cause issues, but a new fuel filter probably won't hurt.

Neither will an intake or exhaust system.

Or an economy tune.

And a light foot.

I get 20.9 mpg avg with mine all-told (calendar year 2009 and holding steady for 2010) with those simple changes + a bed cover and biodiesel (no more than B20 - mostly B5 these days).

Is yours a 4wd? If so, check the hubs to make certain they aren't locked and check your brakes to make certain they aren't dragging.


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Old 04-06-2010, 02:09 AM   #3
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Something isn't right... or you're doing 90 MPH on the highway and driving like a banshee. How are you calculating the mileage?
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Old 04-07-2010, 03:50 PM   #4
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make sure your tire pressure is right also. I had some pretty low milage a few tanks ago couldnt figure out why then I decided to check my hubs and I had them Locked from one of the few times I used my 4x4 lol.
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Old 04-14-2010, 03:13 AM   #5
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im usually cruising at around 65 mph and im pretty easy on the throttle
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Old 04-16-2010, 04:20 PM   #6
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yep, that's low

My truck has never, never got above 18.5 mpg. In defense, I do live at 6,500 feet and there is a 1,000 ft. drop in altitude between me and work.
Winter diesel blends usually drop my mileage about 2 mpg.
That said, I have been religious about tracking my fuel for the past 2 years and currently see 15.2 mpg average for that time. This includes winter, summer towing of my 7.5 k lb tt and 80 to 90 mph trips to Ill.

Yeah, I'd love to see 20 +. Realistically, 16 summer, 14 winter, 13.5 towing. Don't think my #s are too far from the norm.

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Old 04-17-2010, 09:09 AM   #7
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You don't have one of those Gray CMP/CPS Units do you?
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Old 04-17-2010, 02:38 PM   #8
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Quote:
Originally Posted by 300Merc View Post
im usually cruising at around 65 mph and im pretty easy on the throttle
How are you calculating fuel mileage? Do you fill the truck up ALL the way til you can see standing fuel in your filler neck?

Quote:
Originally Posted by van_350sd View Post
You don't have one of those Gray CMP/CPS Units do you?
I do in mine. Last tank was just shy of 17 MPG. Lots of back road driving here in the Ozarks...which means lots of big hills.
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2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
5" Sewer Pipe Exhaust (video clip), DIY 6637 Intake, Wicked Wheel'd, De-foiled, Missing EBPV, Edge Juice with Attitude, X Code Springs, 33" BFGs (SUCK), Alpine W200, Pioneer "D" Series Kevlar 6x8"s, Sirius Satellite Radio, 12" Memphis Pro Audio Subwoofer.
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