Originally Posted by
McLeod
I was wondering that also.
I have never worried about changing the constant even with 15 years of ownership.
Just yesterday I checked constant for the first time and I was shocked.
Going to calculate correct # and change mine too.
Not to throw another formula or method out there and possibly confusing someone, but couldn't you mark the length of a tire revolution, in inches on your driveway and take the results and divide into 5,280' (63,360") to arrive at the revolutions per mile?
I converted to feet but yea that would work too.
Easer to just measure the tire's height and then multiply that by "pi" (pi=3.14) should get you close enough. I would not deduct for tire mash under the load of the truck though.