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Old 12-03-2012, 10:18 AM   #8
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Originally Posted by SydneyRoo View Post
I've checked it out, the rotations ratio is negligibly close. Factory 18s are 235/45/18 and my winters are 205/55/16
According to here:
There would be about a 6% increase with the smaller tires.

In other words if you traveled 100 miles your odometer would actually show 106 miles.

It actually says 5.833%, which @ 30mpg would show as a 1.7mpg increase.

That is just what that site says, I do not actually know how to do any of the tire size calculations.
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