Oversized tire - fuel milage formula - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


Wheels & Tires Semi-Tech General discussion of wheels and tires for the Ford Ranger.
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  #26  
Old 04-29-2008
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Originally Posted by mroctober16 View Post
you gotta figure out the difference in circumference not the difference in diamter.
Don't be silly -- they're EXACTLY proportional, lol.
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  #27  
Old 04-29-2008
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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.
DOH! I'm sure someone has corrected this by now but that's the AREA of a circle, lol -- the CIRCUMFERENCE is: PI x D

We don't care about the area!
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  #28  
Old 04-29-2008
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DOH! I'm sure someone has corrected this by now but that's the AREA of a circle, lol -- the CIRCUMFERENCE is: PI x D

We don't care about the area!
lol dont hate on my math skills, geometry was a long time ago.
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  #29  
Old 04-29-2008
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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

then multiply those 2 numbers together

This is the winning answer. The rest has been a diversion, lol.
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  #30  
Old 04-29-2008
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lol dont hate on my math skills, geometry was a long time ago.
That's the advantage/disadvantage of being in industrial engineering for so long -- like it or not, the basics stick. Most people never need that stuff so I understand but I was laughing at the argument between you all.
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  #31  
Old 04-29-2008
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SUCKY MPG FTMFW!!!!

Brenton
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  #32  
Old 04-29-2008
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What he said! [pulls out his Internet/English dictionary to decode "FTMFW"...]
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  #33  
Old 04-29-2008
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for the ****** effing win..

its ok old timer

you dont get upset I call you old do you john? cause I have a lot of fun doing it!
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  #34  
Old 04-29-2008
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hell yea
i love winning!
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  #35  
Old 04-29-2008
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for the ****** effing win..

its ok old timer

you dont get upset I call you old do you john? cause I have a lot of fun doing it!
Nah, it's okay. When you're old your memory goes and I never remember it anyway...whatever it was...
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  #36  
Old 04-29-2008
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good, i dont like to fight with you anymore (is that called maturity?)
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  #37  
Old 04-29-2008
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No...you're just getting old too!
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  #38  
Old 04-29-2008
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no its called being a party pooper
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  #39  
Old 04-29-2008
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That is one thing Gil has never been!
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  #40  
Old 04-29-2008
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That is one thing Gil has never been!
do you have a crush on me? youre nice!
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  #41  
Old 04-29-2008
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do you have a crush on me? youre nice!

Well, where you deserve it I'll give you props. Don't worry -- I'll tear you down somewhere else...
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  #42  
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Well, where you deserve it I'll give you props. Don't worry -- I'll tear you down somewhere else...
good, my head is floating.
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  #43  
Old 04-30-2008
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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

then multiply those 2 numbers together

Ok this may make me seem dumb but I just spent all day taking a big test at school so my brain is fried.


When you say "multiply those 2 numbers together" what numbers you talking about?
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  #44  
Old 04-30-2008
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The 1.129xxx and what your odometer reads.
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  #45  
Old 04-30-2008
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He gave you a "multiplier" by dividing your new tire size by your old tire size.

You then take that number, and multiply by your miles on your odometer -- or if you've already calculated your MPG you can multiply your MPG by the multiplier.

In other words, if you drove 100 miles and used 10 gallons, and your multiplier was 1.2 then you can do either of these:

100 * 1.2 = 120 miles. 120 miles / 10 gallons = 12 miles/gallon

--OR--

100 miles / 10 gallons = 10 miles/gallon. 10 miles/gallon * 1.2 = 12 miles/gallon

That help any?
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