'02 7.3L-12'' on 40s - Ford Powerstroke Diesel Forum
Suspension & Steering Discuss OEM & aftermarket suspension, lifts, air ride suspension, shocks, steering components, etc.

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post #1 of 19 Old 10-18-2009, 09:35 AM Thread Starter
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'02 7.3L-12'' on 40s

Found a 7.3L in great shape and for a great price. It has a 12" lift with 40" tires and I was wondering if anybody had any idea about what fuel economy I should expect out of this. It has a programmer chip but im not sure if it set up for increased fuel economy. I also tow a 22' bay boat sometimes. Should it pull this OK?
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post #2 of 19 Old 10-18-2009, 09:43 AM
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Need more info. Type of tuner, gearing, auto or manual, stuff like that.

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1997 Ford F-350, Dually conversion, Cobra 29 LX CB, 12000 watt converter, All LED lights, TW tunes, 4" DP, Napa Intake and lots of running lights.

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post #3 of 19 Old 10-18-2009, 09:53 AM Thread Starter
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stock gearing and automatic. not sure of the tuner but i will find out
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post #4 of 19 Old 10-18-2009, 07:28 PM
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10-13mpg's, but who cares about fuel milage, you are looking at a truck sittin on 40's. If you want mpg's go buy a prius

2008 F-250 CC SB 6.4 FX-4

Pro Comp 6" lift
37" Super Swamper M16's
20x10 BMF S.O.T.A. death metal
Spartan 275
S&B Intake
Flo-Pro 5"
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post #5 of 19 Old 10-18-2009, 07:48 PM
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Originally Posted by Nor-CalF250 View Post
10-13mpg's, but who cares about fuel milage, you are looking at a truck sittin on 40's. If you want mpg's go buy a prius
I know why he cares lol. Fuel is gonna keep goin up.

2002 Lariat 7.3 4x4-- 250,000 miles

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post #6 of 19 Old 10-19-2009, 07:24 AM Thread Starter
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Ok it is a "Superchip" that is currently installed and the truck has stock gearing. Im just wondering what type of modifications i would need to make to maximize fuel economy? I can handle 10-13 mpg, but when i make the long hauls it would be nice to get a little better. And sorry NorCalF250, but you will never see me driving a Prius. If you do, then please run over me.
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post #7 of 19 Old 10-19-2009, 07:49 AM
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I dont think you will like towing with 3.73's and 40's. I know your trans wont. LOL
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post #8 of 19 Old 10-19-2009, 08:28 AM Thread Starter
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so if i regear to 4.30 would it help?
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post #9 of 19 Old 10-19-2009, 08:35 AM
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4.56 gears for 40s, and get a TW 6pos programmer.


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post #10 of 19 Old 10-19-2009, 09:32 AM
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Mine has averaged around 12mpg not towing. Im a 8-10" lift with 40's and 4.88 gears.

All mods in sig.

2014 F250 4x4 CCSB Platinum
Dieselsite water/fuel filter, Stingray 40" LED with Randy Ellis mounts, High Idle mod, Airbags, Marathon Seat Covers, LED lights.

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