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post #1 of 13 Old 02-15-2008, 10:12 PM Thread Starter
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mpg

mt trucks onboard computer told me it was only get around 10 mpg. so i tested it sure enough im only gettin around 10 mpg any sugestions like wut to change,check,or mod

2003 ford 250 lariat 6.0
35x12.5x20
nitto mud grappler



mods:
afe stage 2
sct livewire
4" single with 6" tip
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post #2 of 13 Old 02-15-2008, 11:49 PM
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If you put an exhuast and a intake on it will probally get you a couple mpg's. Everyone seems to talk the Amsoil up, Ive never tried it though. Probally the best way to help out the millage, is to watch youre rpms.
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post #3 of 13 Old 02-16-2008, 12:07 AM
Other vehicle is an F250
 
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Bought my 7.3 pretty much like it is but I was able to talk with the previous owner. Before lift and 35" tires it got 21 mpg. 12 mpg now.

I plan to lower it a bit but I really like the 35s.

2001 F250 Lariat Crewcab, Automatic, 4X4

(Late '99 Regular Cab Work Truck)


6.5" Pro Comp Lift ~ Traction Bars ~ Son-Built Sliders ~ 16" Pro Comp Xtreme Wheels with 35" BFG TA KM2s
4" Banks Exh.-Power Elbow ~ Wicked Wheel ~ DIY AMSOIL EaAU4090 Intake ~ PHP 6 Pos Chip ~ LowDown LED Upgrade
Stage 1 Injectors ~ HankDaddy Mod. ~ BUILT TRANNY! 352 HP Shootin' for 375!
CAROLINA POWERSTROKE ASSOCIATION
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post #4 of 13 Old 02-16-2008, 03:31 AM
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The 35s don't help you at all and unless the speedometer has been recalibrated for them, you are driving some miles that are not registering. This could be more than a 10% difference. Still that would only give you 11 mpg.

What type of driving do you do? Idle time is very hard on fuel economy with a 6.0. If you don't believe me just fill up your tank, drive about 20 miles then let it sit and idle for 5 minutes and watch the mpg drop like a rock on the dash meter. Even after you have burned 1/2 tank of fuel this experiment will work. Every 5 minutes my truck idles seems to drop the mpg by .1 or more. Another thing that greatly affects mpg is tire inflation. It gives a more harsh ride but max inflation will yield better mpg.

Exhaust didn't yield me any additional mpg. A zoodad mod didn't give me anything either. My biggest gains have been with SCT custom tuning and a good cetane boosting fuel additive. Tire pressure is another area where I see gains or losses. The air filter is an often overlooked area. I changed my first filter at 30,000 miles and although it appeared to still be clean and the filter minder never moved, It was amazing how much of a change I saw when I put in a new filter. The level of black smoke produced by my race tune tapered off drastically telling me that it was indeed time for a change. Fuel filters also play a role in this equation.
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post #5 of 13 Old 02-16-2008, 09:52 AM Thread Starter
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new fuel air just did an oil change and i i have muff nad kitty delete on my stock 3 1/2 exhaust any other sugestitions

2003 ford 250 lariat 6.0
35x12.5x20
nitto mud grappler



mods:
afe stage 2
sct livewire
4" single with 6" tip
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post #6 of 13 Old 02-16-2008, 09:55 AM
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I have noticed that mine went down drastically in the winter just due to the increased idle time, and the winter blend fuel.

Josh

04 F350 CC SB DRW IT HAS SOME STUFF

"Idiopathic, from the Latin meaning we're idiots cause we can't figure out what's causing it." House M.D.
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post #7 of 13 Old 02-16-2008, 10:10 AM
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stop racing ha ha yea right

03 F350 PSD
7.3 AUTO
EXT. CAB,
LWB, FX4
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post #8 of 13 Old 02-16-2008, 11:03 AM
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The best way to check your mileage is with a garmin or other GPS system. We have 315's on our EX and average about 19 on the highway and 15 around town. Our overhead console is off 4.5 gallons. In a 208 mile trip the odometer read 192 miles not a huge difference but averages 1.5 mpg different than the gps.

Pat

2000 F250 Carpenter's Union local 2214 LOOKING FOR SIDE JOBS

Mac intake,5" exhaust with6" tip,Zoodad,foil delete, ts chip, WW

96 E350 bad trans mod NO MORE.
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post #9 of 13 Old 02-16-2008, 01:31 PM Thread Starter
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still even at 1.5 off thats still only 11.5 still way low

2003 ford 250 lariat 6.0
35x12.5x20
nitto mud grappler



mods:
afe stage 2
sct livewire
4" single with 6" tip
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post #10 of 13 Old 02-16-2008, 02:28 PM
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Not really all that low. My truck averages about 14.5 mixed driving and it is stock height. I get a little over 17 on long highway drives maybe 18 depending on the wind. You should look into a programmer or custom chip it will increase your fuel mileage some. My brother and I both had chevy trucks same options mine was lifted and ran on 35's I got a consistent 12mpg no matter how I drove it. My brother got a best of 11 on highway and 8 around town, mine had a Hypertech programmer on it.

Pat

2000 F250 Carpenter's Union local 2214 LOOKING FOR SIDE JOBS

Mac intake,5" exhaust with6" tip,Zoodad,foil delete, ts chip, WW

96 E350 bad trans mod NO MORE.
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