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I drive a 99' and get about 520km from full to when the light turns on and I drive pretty hard/fast. 400km until the light sounds kind of low under normal driving conditions. maybe you need a tune up? My light comes on after I've used about 14 gallons of gas.
I've seen the fuel guage dropping off fast or not going all the way full on other cars. It ended up being the sending unit that needed to be replaced. It's basically a thing that goes in the the gas tank with a float that gets pushed to the top when the tank is full and goes down when the fuel level goes down. But i did a search of the Porsche 986 catalog for "sending unit" and found nothing. So maybe it is called something different in the Porsche world.
HTH,
Larez2
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