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I hope you did do a check of the odometer. Many of them are off by 5%, giving you more mpg than you actually are getting.

you need to do at least 20-100 miles of checking what your odomoter says vs the highway mile markers.


I wouldn't depend on the accuracy of mile markers. I would use GPS to determine distance.

The older your tires are, the better your gas mileage gets - as the tires wear down, your MPG goes up. maybe up to 5% by the time your tires are fully worn out and you buy new ones.

A lot of that has to due with rolling resistance. Some of it is just an illusion since your car didn't go as far as you think it did with worn tires since the diameter has gotten smaller.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=1...
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