Quote:
Originally Posted by oil pan 4
Figure out what the difference between the new tires and old are and add that to the miles per tank.
I have found that most speedometers read high anyways.
Putting on bigger tires makes it read closer to reality.
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Worth noting that speedos are calibrated to read higher than actual speed, while odometers are calibrated to be (mostly) accurate.
On my Jeep I had to go to a 2" taller tyre for the speedo to now read accurately (actual speed is 1% higher than displayed - that's kind of how I like it). The odo now reads ~6% less than actual distance traveled.
You can also confirm this via OBD, the (uncorrected) OBD speed may not match what's displayed on your OEM gauges.