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I got less than 20 mpg around town before my new 02 sensors. Now I get about 23 mph in town and over 25 on my "road trips" to the country where I hammer it the whole time. Go figure.
If your boxster has 60k on it, replace your 02 sensors before they go out and throw a CE light... you'll be glad you did and enjoy the fuel savings as well.
I believe performance went up too after I changed them, but that's just my butt dyno.
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