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post #1 of 5 Old 07-08-2011, 11:08 PM Thread Starter
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What else can help?

I am trying to improve my fuel economy. I am getting about 11.2 mpg on a 99 F250 on 37's with 3.73 gears. I just ordered the 6637 mod, and did and oil change with wix filter, and fuel filter change with a wix as well. I have clean and tightened my up pipes and found no leaks. Where else should I look? I keep my foot off the pedal. Thanks everyone for all the help you have given me so far.
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post #2 of 5 Old 07-08-2011, 11:38 PM
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Keep the rpm's around 1750, boost in the LOW single digits-allow your speed to fluctuate a bit-drop a few mph uphill, gain a few downhill.

Other than that, a chip (I'd get an 80hp econo from DPtuner.com-jody knows his stuff) a 203 degree thermostat, free flowing exhaust, make sure the tires have 70+psi in them, and your hubs are unlocked if you have a 4x4.

My early 99 cclb 4x4 would get 20.7 unloaded on the highway at 59mph. I could go 740+ miles before stopping for fuel. That sort of driving took discipline.



2005 Lariat CCSB F-350 SRW
300,000 miles and going strong

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12" fabtech lift with 40" Xterrain's on M/T classic locks, Adjustable track bar, Bilstein 7100 reservoir shocks

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Edge juice/attitude CTS, SCT with ID tunes, Snow meth. injection, Diamond eye 4" exhaust, 03 turbo, ARP studs, Sinister coolant filter

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2010 stone seats/console, pioneer avic d3 with backup camera/bluetooth

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Viair 450c compressor, dual 2.5 gallon tanks, air horns rated @115db
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post #3 of 5 Old 07-09-2011, 08:26 AM
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Not too much will help, you're running 37" tires with 3.73's. If you were running like 4.56's or went down to say a 285/75/16 you would pick up several MPG's I'm sure.

Tim

2001 F-250 Lariat CCSB, 4x4, ZF6 249k, 6.5" Procomp lift, 37" Toyo M/T's, 20" Fuel Hostages. PIS 160/30's, PHP Hydra, 6637, 4" exhaust, Tank mods, ISSPRO's, 08+ mirrors/tailgate/tail lights, M12000 winch.



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post #4 of 5 Old 07-09-2011, 09:28 AM Thread Starter
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well more specifics on the truck.. It does have a F5 chip from Jody set on an economy tune. Also has a 4in downpipe in a 5in exhaust.
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post #5 of 5 Old 07-09-2011, 10:14 AM
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My 99 had a 8.5" with 37's, and unloaded I could get 17ish. That was also with 373's.



2005 Lariat CCSB F-350 SRW
300,000 miles and going strong

Exterior
12" fabtech lift with 40" Xterrain's on M/T classic locks, Adjustable track bar, Bilstein 7100 reservoir shocks

Performance
Edge juice/attitude CTS, SCT with ID tunes, Snow meth. injection, Diamond eye 4" exhaust, 03 turbo, ARP studs, Sinister coolant filter

Interior
2010 stone seats/console, pioneer avic d3 with backup camera/bluetooth

Misc.
Viair 450c compressor, dual 2.5 gallon tanks, air horns rated @115db
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