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Chris,
I replaced mine about 2 years ago and didn't recall any improvement in MPG, however I was so happy that it fixed my engine cut-out at ~5500 rpm, that I never bothered to check.
Did it fix your idle issue? If not, cleaning the throttle body is a good (and inexpensive) option.
__________________
BoxsterBob - CA
2014 Boxster S
Previous - 1999 Boxster / 1972 914
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