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Old 10-03-2009, 10:13 PM   #87 (permalink)
cfg83
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Join Date: Dec 2007
Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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salty9 -

Quote:
Originally Posted by salty9 View Post
Odometer MPG increases with tire wear due to 2 reasons one of which is illusionary. As the tread is worn away the tire has less rolling resistance (more MPG). The circumference is also decreased which leads to more tire revolutions per mile and higher indicated MPG. I noticed this when I had new tires installed.
Yup, that's why I do a GPS/Odometer correction check every 6 months or so.

CarloSW2
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