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If you run you car on E or below most of the time you can overheat the fuel pump. The fuel pump is submerged in the fuel to help with cooling the pump.
Running a car low on fuel constantly, you have more room for condensation of water inside the tank on cooler days. I have seen this as a cause for a mystery driveability problem and or excessive pingging.
I agree with insite, the computers will recalibrate and normal performance will return. The check engine light is probably an upset purge system (evaporative emmisions equipment). Driving on a flat surface for several miles between 50 and 65, constant throttle, the purge system will run its internal dianostics and purge the charcoal canister while cruising. You probably have a few other "soft" or temporary codes (lean misfire, O2 sensor readings) that will reset once the computer recalibrates.
This should shut off the check engine light on its own once the purge cycle is complete. If the light stays on, disconnect the negative cable for a minimum of 2 minutes then reconnect. Make another road trip as described above. If the light comes back on, have it checked by Porsche.
This check engine light can appear when the tank is overfilled, dumping fuel into the canister vent at the top of the filler neck. It can also happen if the gas cap is loose or leaking.
Dave
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