Quote:
Originally Posted by capnbass91
I tested the accuracy of the odometer by seeing if 1 mile on my odometer was equal to 1 mile maker on the highway, and it was accurate. Did this on a long trip and didn't get off one bit. Also doubled checked the distance on google maps, the trip length matched what I had on my trip odometer. It was also calibrated when I got my knew tires, and so far it's right on still.
I have my old tires, and when I put them next to my new ones the 17"ers are definitely bigger.
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If the odo wasn't calibrated for the old tires, then it would have been giving you falsely-lower MPG calculations. Then, putting stock tires back would bring the numbers back to where they should be.