First mpg report after going to 32in tires - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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  #26  
Old 07-21-2008
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stock tire size is more than likely 245/75r16 soo 245/25.4X.75X2+15=30.48
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  #27  
Old 07-21-2008
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Quote:
Originally Posted by jrpro130 View Post
Yea wow, 284! I'm lucky to get 230 out of a FULL tank
Same with me
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  #28  
Old 07-21-2008
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So I had stock 245 and then jumped up to 285. So with my math I get roughly 1.16.

With that number I multiply that by the number of miles I get in a tank and then divide by how many gallons I put in. That should then leave me with my new mpg?

It makes sense and makes me alot happier when I figure out my mileage. How accurate is it though?
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  #29  
Old 07-21-2008
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i got 1.08 from a 245/75r16 to a 285/75r16

because 32.84/30.48=1.08
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  #30  
Old 07-21-2008
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Quote:
Originally Posted by toreador4x4 View Post
i got 1.08 from a 245/75r16 to a 285/75r16
How did you get those numbers?

Edit: I see how you got those numbers but how did you figure out the 32.84 vs 30...?
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  #31  
Old 07-21-2008
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edited last post so you could see ^^^^
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  #32  
Old 07-21-2008
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Quote:
Originally Posted by toreador4x4 View Post
stock tire size is more than likely 245/75r16 soo 245/25.4X.75X2+15=30.48

Where did you get these numbers...245/25.4X.75X2+15= (doing that math I get 29 and change)

I just want to know so I can do any truck I want.

Last edited by Lord Of War; 07-22-2008 at 12:08 AM.
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  #33  
Old 07-22-2008
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I have a tuner...I was up to 18+mpg when I was on 33's and 4.10's, not towing, with the eFan and pullies wiht 93 performance tune. I was loving that :) Then the urge to go bigger hit me...and my wallet :)
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  #34  
Old 07-22-2008
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jake, what size rim do you have? i did 15 and you did 16. check that
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  #35  
Old 07-22-2008
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do you understand what all the numbers in that equation mean?
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  #36  
Old 07-22-2008
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Wow I am lucky to hit 200 miles with a 15 gallon tank! lol Of course I drive like **** with the pedal to the metal!!!!
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  #37  
Old 07-22-2008
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Quote:
Originally Posted by toreador4x4 View Post
do you understand what all the numbers in that equation mean?
Not really. Let me know what they mean.

Thanks
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  #38  
Old 07-23-2008
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ok...245(tire width)/25.4(mm to in)x.75(tire aspect ratio)x2(sidewall height top and bottom+15(rim size)
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  #39  
Old 07-23-2008
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Mike, did you change the revolutions per mile setting?

(I'm about to go with 32s myself)

Rich
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  #40  
Old 07-23-2008
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Yes everything was corrected for the new tires Rich.
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  #41  
Old 07-25-2008
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Justin I got it all figured out now.

2 x 285 x .75 / 25.4 + 16 = Tire Diameter

So is this really accurate when considering your miles per gallon?
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