Yup, another MPG question.. - Ford Powerstroke Diesel Forum

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post #1 of 44 Old 10-07-2009, 09:46 AM Thread Starter
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Yup, another MPG question..

Well, ive searched all over and found all kinds of posts with guys saying 'i get xx miles to the gallon', and the next guy 'well i get xx miles' so here goes..

I have a 2002 7.3 xcab with the long bed.
I have straight piped exhaust (no cat muffler anything).
I have the DIY tymar intake.
Ive done those diesel 'clean your injectors' treatments many times.

I filled up with diesel, set my trip meter to 0. Im now at less than an 1/8 of a tank at 420 miles. Ill probably get to 450 and have to refill. 450/36= 12.5mpg.
Is that low? Probably 350 of those 400 miles are highway miles. And I stay below 2000rpm most of the time.

I hear people saying 15 18 19 city and like 20 22 highway. My boss at work says he gets 600 miles off a full tank (and hes always in the city, lives and works in same city).

Any ideas/suggestions/'clean this'/'use this treatment'?

Thanks!

2002 F350 7.3
PHP FU, Isspro's, DIY Intake, 5" Stacks, WW, 08 Mirrors/Gate/Tails.. etc
Pics and full list of mods ~HERE~
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post #2 of 44 Old 10-07-2009, 09:59 AM
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I change my fuel filter about every 6-8 months. I aim to keep a minimum of 5% biodiesel in the tank, and I mix in Stanadyne per their instructions. I get about 15 city and 18.5 highway. Doing that DIY Intake jumped me up a bit in fuel efficiency. I should put my DP Tuner back in (I took it out to get Ford to check my tranny and haven't put it back in shame shame shame on me).

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires
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post #3 of 44 Old 10-07-2009, 10:01 AM
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I average 17 around town the only difference is I have a gryphon programmer from PHP, And I run it on the 120hp setting. Have you changed or checked your fuel filter lately? Do you have an auto or manual and what gearing do yo have? might help with the question

2002 F350 Crew cab Lariat
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post #4 of 44 Old 10-07-2009, 12:14 PM
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you need a tuner stock all trucks suck.....

7 speed transmission on a 350
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post #5 of 44 Old 10-07-2009, 02:35 PM Thread Starter
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I just changed my fuel filter ~3000 miles ago, so less than a few months ago.

I'm a broke college kid so I cant afford a couple hundred dollar chip yet.

And I feel like ever since I did the intake, my milage went down. Maybe the K&N isnt good? I have a 6637 coming but its roughly the same size as K&N so..

My gearing in the rear end is whatever stock is, automatic tranny.

Only other thing I can think of is wind drag from lightbar (?) which is only like maybe 3 inches on my roof, or the fact that my suspension in the front is shot.

2002 F350 7.3
PHP FU, Isspro's, DIY Intake, 5" Stacks, WW, 08 Mirrors/Gate/Tails.. etc
Pics and full list of mods ~HERE~
Waltham, MA

Looking for an 8 foot bed in the New England area!
If you have one, or know who does, please PM me.
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post #6 of 44 Old 10-07-2009, 02:38 PM
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seemed like when i did the cold air intake on all my trucks, my mpg's went down too. you should get better than 12 tho. is that hand calculated?

05 Single Cab Short Bed
*03 Turbo*Stroked Injectors*AFE Stage 2*Small mouth Intake*SCT With Eric's Extreme Race*4.30 Gear*Best ET 13.5@99MPH*
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post #7 of 44 Old 10-07-2009, 02:43 PM
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See my sig - I get about 12-13 city only and I've gotten as high as 19 open highway non-towing. Towing my 12K 5th wheel, 10-11 is about it depending on the terrain.

Additives, I've been using Diesel Kleen pretty regular.

IF 350 of your 400 miles are highway, I think I would expect better than 12.5.


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post #8 of 44 Old 10-07-2009, 02:43 PM Thread Starter
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Yup. I had ~450 miles on trip meter from way full to gas lite. So 450/36=12.5mpg

My tank is 36 gallons rite? Biggest one Ford makes? If its bigger, then my mpg sucks even more lol..

**Edit: Maybe not 350, but I commute ~25 miles each way to school every day, so about 50 highway miles a day, 5 days a week, and I fill up about once a week, if im lucky..

2002 F350 7.3
PHP FU, Isspro's, DIY Intake, 5" Stacks, WW, 08 Mirrors/Gate/Tails.. etc
Pics and full list of mods ~HERE~
Waltham, MA

Looking for an 8 foot bed in the New England area!
If you have one, or know who does, please PM me.
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post #9 of 44 Old 10-07-2009, 03:01 PM
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Are you using just the 36 gallon tank as the amount -OR- are you using what the pump says the tank took in?

I have a CC LB so I have a 38 gallon tank. When I fill up, I take the mileage I drove divided by what the pump says went in. Ex. If I drove 400 miles and put in 30 gals that comes out to 13.3 mpg. If either number varies, the mpg number comes out differently.


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post #10 of 44 Old 10-07-2009, 03:14 PM Thread Starter
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Well, in that case, I think my mpg would be even worse. If I have the 38 gallon tank, then I probably got almost 38 gallons in. It was pretty damn empty, and I WAY overfilled it, past the click.

2002 F350 7.3
PHP FU, Isspro's, DIY Intake, 5" Stacks, WW, 08 Mirrors/Gate/Tails.. etc
Pics and full list of mods ~HERE~
Waltham, MA

Looking for an 8 foot bed in the New England area!
If you have one, or know who does, please PM me.
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