mgs tire size???
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Senior User
Joined: Sep 2004
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From: flordia
mgs tire size???
i have a 1994 F150 302 ext cab gitting 22 mpg and i want to level tha front and run 30 or 31s but maintain 20-22 mpgs wat gear ratio should i run
right now i have 235-70-15 3.55 rerar end with locker
sorry so long
right now i have 235-70-15 3.55 rerar end with locker
sorry so long
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
I'm guessing that milage is all hwy?
What speed do you typically drive at?
3.91 would return you to the same final gear ratio, but opt for 4.10 for a little more performance.
P.S. Here's a simple online calculator, your current tires are just about 28" in diameter.
http://www.rocky-road.com/calculator.html
What speed do you typically drive at?
3.91 would return you to the same final gear ratio, but opt for 4.10 for a little more performance.
P.S. Here's a simple online calculator, your current tires are just about 28" in diameter.
http://www.rocky-road.com/calculator.html
Cargo Master
Joined: Jun 2002
Posts: 2,033
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From: Aurora,Colorado
I wouldn't change a thing on this truck that gets 22MPG!!!.
Super Moderator
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You can regear to run the same or close rpm @ a given mpg, but you will not see your 22 mpg again with this change.
--you are increasing your frontal area. Wider tires, and the truck sits higher on them, you are going to change your "angle of attack" into the air, and your lift will expose more truck to the wind as well.
--the wider tire will have more rolling resistance.
--the tires will weigh more, requireing more energy to make them move and stop.
If you are lucky after all this, you may see 18 mpg.
--you are increasing your frontal area. Wider tires, and the truck sits higher on them, you are going to change your "angle of attack" into the air, and your lift will expose more truck to the wind as well.
--the wider tire will have more rolling resistance.
--the tires will weigh more, requireing more energy to make them move and stop.
If you are lucky after all this, you may see 18 mpg.
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From: flordia
10:4 ya that is at highway speed sometimes 23 in tha city 19.5
tha truck aint stock im not to worried about power i have some to spare
thanks for tha input how bad would a 4.10 and 30's hurt but running tha same width tire
I typically drive at 65mph at about 1800rpm i live in FL and do alot of highway driving
tha truck aint stock im not to worried about power i have some to spare
thanks for tha input how bad would a 4.10 and 30's hurt but running tha same width tire
I typically drive at 65mph at about 1800rpm i live in FL and do alot of highway driving
Last edited by redneck4242002; May 17, 2009 at 06:52 PM. Reason: left out some stuff
Cargo Master
Joined: Jun 2002
Posts: 2,033
Likes: 32
From: Aurora,Colorado
10:4 ya that is at highway speed sometimes 23 in tha city 19.5
tha truck aint stock im not to worried about power i have some to spare
thanks for tha input how bad would a 4.10 and 30's hurt but running tha same width tire
I typically drive at 65mph at about 1800rpm i live in FL and do alot of highway driving
tha truck aint stock im not to worried about power i have some to spare
thanks for tha input how bad would a 4.10 and 30's hurt but running tha same width tire
I typically drive at 65mph at about 1800rpm i live in FL and do alot of highway driving
Dont mess with the "Wonder Truck"-dont change anything!! 19.5 MPG in the City??
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Post Fiend
Joined: Nov 2008
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From: McKenzie River
If you are actually getting 22 mpg. out of a 4x4 F-150 302, CHANGE NOTHING!!!!!!..........You can kiss those MPGs goodbye with 4.10s and 31s.
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Thread Starter
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Senior User
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From: flordia
but there is no possible way to run it with out entirely killin it
Post Fiend
Joined: Nov 2008
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From: McKenzie River
I assumed because you wanted 31s it was a 4x4, even for a 4x2 thats incredible mpg. 4.10s and 31s will still knock that mpg down at least 2 to 3 mpg, most 31 x10.50s have much greater rolling resistance than 235 x 75 15s and 4.10s will have your rpms higher. Things like this will add up and kill those great mpgs, unless it does not matter to you about gas $$$.........I would leave it alone.
Cargo Master
Joined: Jun 2002
Posts: 2,033
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From: Aurora,Colorado
Wonder Truck
Yeah-dont change a thing on this truck. Just give it a wax job-and check the PSI on your 235s and try giving it higher octane gas.
The 302 has a knock sensor and my 302 gets better MPG with higher octane. The better gas allows more spark advance-especially in high mileage (more than 100k) engines.
Let us know if you break 30 MPG .......
Wonder Truck doesnt glow in the dark-does it??
The 302 has a knock sensor and my 302 gets better MPG with higher octane. The better gas allows more spark advance-especially in high mileage (more than 100k) engines.
Let us know if you break 30 MPG .......
Wonder Truck doesnt glow in the dark-does it??
Fleet Owner
Joined: May 2009
Posts: 21,437
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From: Gilbert, PA
22hwy 19cty!!! That is awesome milage.
As for going 4:10's On my 94 lightning i am running 4:10's and 275/55/18(29.8") and the absolute most i can get is 16mpg. O and i am approx 4" lower than a Standard f150
As for going 4:10's On my 94 lightning i am running 4:10's and 275/55/18(29.8") and the absolute most i can get is 16mpg. O and i am approx 4" lower than a Standard f150
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From: flordia
lol no i dont think ill break 30 im alawys trian to find ways to improve it though without hurtin pullin capability or to much power
but ya she gits a full manicure every 2 weeks and complete inspection and tune up every couple months but shes never seen anyhin but 93 octane fuel
there is 205k miles on her owned it 1996
thanksfor tha info bout liftin it i dont thank im goin to do it
but ya she gits a full manicure every 2 weeks and complete inspection and tune up every couple months but shes never seen anyhin but 93 octane fuel
there is 205k miles on her owned it 1996
thanksfor tha info bout liftin it i dont thank im goin to do it