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Old 09-09-2012, 06:00 PM   #1825
ans2k
Scooby Specialist
 
Member#: 315631
Join Date: Apr 2012
Location: Bryant, AR
Vehicle:
2012 Impreza Sport

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Quote:
Originally Posted by sgoldste01 View Post
I haven't researched it, but it's my guess that car manufacturers must make their odometers within a certain percentage of perfect accuracy, and that our 2.7% inaccuracy falls within this range.

I also guess that as the tires wear, the odometer becomes more accurate, to the point where it's over-calculating distance by the time your tires' wear bars are exposed. So the distance calculation might be 2.7% low with new tires, 2.7% high with tires that are worn out, and just about perfect if averaged over the life of the tire.

So to your comment, no, I don't find this concerning at all.
while looking up tires and their specs. i notice that the S34 oem tires are 25.2 tall(overall diameter) and tires such as G-max and DWS are only 25.1 inches tall. that means, that those tires will be closer to the odometer calculation and slower to the speedometer than the oem tires. just food for thought
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