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I think OP should check his math. Based on what he has said, no leaks, no odours - it might just be bad math? 16 mpg is quite low. He hasn't answered Monty's question about total miles driven per/trip. If it's start, short drive then stop, that will impact economy more than anything really.
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2011 Boxster 987.2 Arctic silver / Black leather, PDK with Sports Chrono Package Plus
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