gustrider4

Im stuck when it comes to this. When i lifted my 2002 f150 scab. I put bigger tires on it. I am getting a proggrammer to program speedo for actual speed.

Mileage on truck when tires were changed- 79,344
Mileage currently on truck - 81,675

Old tire size- 235/75/16 which are 29.877 in diameter
New tire size- 265/75/16 which are 31.649 in diameter


What I want to know is, what is my actual mileage on this truck. Im assumming its more than what the odometer is reading due to the truck rolling more than the speedo is reading. I have found out, that when the speedo is reading 60MPH, its doing approximately 64MPH.

If anyone can shed some light and show me a formula and/ or just figure it out for me that would be great. The programmer will be in tommrow so when i change the speedo settings, i will record mileage on dash. thanks in advance.

Tackle

Where is the math teacher when you need him... [MENTION=99584]ibd2328[/MENTION]

FordTruckMotorsport

I dont know if i am right, but,here is what i did...

81 675-79 344=2331/29.877=78.01x31.649=2469.25+79344=81813.25

There would be 138 miles of diffrence wich sounds good to me considering both tire size..

gustrider4

thats deff a good start at trying to figure it out, if i had to assume, i would think u got it right cause if it was wrong, the number would be way out of wack. thanks for the help man, anyone else wanna give it a shout, post it up.

SR2K

81813 Miles, similar method to Gustrider, divide the old tire size by the new (~1.05) multiply by the difference between the two odometer readings, and add to the old reading.

gustrider4

but your saying ford motorsport method does work

ibd2328

iTrader: (2)

You want an easy formula or just the #

gustrider4

both, lol

techrep

iTrader: (1)

I am wondering why does it matter

SR2K

Things like oil changes, general matenance, tires, plus calculating gas mileage.

Multiply whatever number your odometer gives you by 1.05 and you'll get the actualy number