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I get about 22mpg in mixed driving and up to 30mpg on the highway. Maybe your OBC is wrong. Try measuring the old fashioned way. Fill the tank, log the mileage, drive the car. On next fill up note the gallons added and just divide miles driven by gallons used.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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