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I'm wondering what method you are using to estimate fuel mileage?
Pump gallons/odometer is most accurate. If you are using the built in computer mileage gauge then be sure to reset it at a new tank of gas to get a good avg read.
Otherwise its just a cumulative average including the time it sits idling in the driveway, waiting to pick up kids after school etc etc and skews the results a bit.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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