it seems like even though i top off the tank, the gas needle doesnt quite reach the 1/1 mark, but sits below that. also when i fill up when the needle is almost at the bottom i can never fill more than 18 gal, telling me that the gas gauge isnt quite normal.
not a big deal b/c i can live with it, but is this a common problem? i'm guessing there is no easy fix.

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Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe