Oversized tire - fuel milage formula - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-18-2008
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Oversized tire - fuel milage formula

A while back I saw someone posted in a thread how to calculate fuel mileage w/ oversized tires.

I did a couple searches but couldn't find it. Could someone post it up for me, thanks.
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Old 04-18-2008
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I dont think you can do that.
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Old 04-18-2008
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figure out the fuel mileage
divide your new tire size by the stock tire size like i have 35s and 31s were stock, so my number is 1.129xxxx

then multiply those 2 numbers together
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Yea I cant do that! lol
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Old 04-18-2008
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puff puff pass man lol
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Old 04-18-2008
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Quote:
Originally Posted by 99ranger4x4 View Post
figure out the fuel mileage
divide your new tire size by the stock tire size like i have 35s and 31s were stock, so my number is 1.129xxxx
you gotta figure out the difference in circumference not the difference in diamter.
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Old 04-18-2008
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im 99.9% sure the pi and **** cancles out

there was a big argument in another thread a while back
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Old 04-18-2008
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ok thats a valid point, but circumference = pi x r^2
so you still gotta square the radius of the tire.
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Old 04-18-2008
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What are the stock and currant sizes of your tires?
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Old 04-18-2008
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its in the door jam of your truck. it varies
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Old 04-18-2008
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Quote:
Originally Posted by mroctober16 View Post
ok thats a valid point, but circumference = pi x r^2
so you still gotta square the radius of the tire.
yea both are being squared.. can't that be cancled out too?
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Old 04-18-2008
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Originally Posted by mroctober16 View Post
so you still gotta square the radius of the tire.
If you do that you might sacrificing the ride quality
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Old 04-18-2008
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Sounds like muffler bearings to me...
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Old 04-18-2008
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Quote:
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If you do that you might sacrificing the ride quality
lol nice
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Old 04-29-2008
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circumference is 2 x pi x radius, the AREA is pi x r^2
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Old 04-29-2008
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99ranger4x4 is right.
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Old 04-29-2008
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dude, you cant "caluculate" your gas mileage with a tire based on size alone. there are a lot of other factors.
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Old 04-29-2008
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Quote:
Originally Posted by [email protected] View Post
dude, you cant "caluculate" your gas mileage with a tire based on size alone. there are a lot of other factors.
True, rotating mass and tire width have a bit to do with it, just to name a couple.
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Old 04-29-2008
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Quote:
Originally Posted by winks View Post
True, rotating mass and tire width have a bit to do with it, just to name a couple.
yeah all those, not to mention friction from tread design, compound duro, wheel weight, wheel size, offset, and thats just in the wheels...
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Old 04-29-2008
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Get a programmer. Adjust for the new tires. Fill up tank. Hit the trip button to 0. Drive till gas light. Refill, take gallons put in tank till its filled back up. Then take the mileage on the trip. Divide that by the amount of gallons and bam. You have MPG that is atleast 95% correct.
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Old 04-29-2008
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you guys are all wrong, heres what you do, when your filling up next time, just look at how much its costing you and cry.
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Old 04-29-2008
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you guys are all wrong, heres what you do, when your filling up next time, just look at how much its costing you and cry.
THREAD WINNAAAAR!
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  #23  
Old 04-29-2008
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Don't know why you guys are making this so complicated. MPG is an easy formula.
Miles driven, divided by, number of gallons used, equals miles per gallon.
With over size (or under size) tires, you have to adjust for the difference in size.
You can get a tuner corrected for the current set up.
Or you can find out how far off your speedometer/odometer is
by checking it against the mile markers on the side of most highways. Then adjust.
For instance if your odometer is 10% slow. (odometer says you have traveled 10 miles
and the mile markers say you've gone 11)
All you have to do then is add 10% to the "indicated" miles traveled to get true miles traveled.
If the odometer is fast, subtract the proper amount. Then divide by the number of gallons used.
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Old 04-29-2008
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Quote:
Originally Posted by blloyd1213 View Post
circumference is 2 x pi x radius, the AREA is pi x r^2
either way it all still cancles out

Quote:
Originally Posted by 04blackedge View Post
99ranger4x4 is right.
i know, except for whats mentioned later in the thread, it also has to do with tread pattern and and fun stuff
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Old 04-29-2008
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Yeah put your way will give you approximate mileage.
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