Have you checked if there is a fuel leak around the filters snap on connectors. It doesn't need much of a weep while driving to blow out your fuel usage - remember it will only leak when the engine (or ignition) is on or running.
So to confirm a leak, you will have to get under the car with the ignition in the "on" position to pressure up the system.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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