ABO, you are not alone. I heard after the break in period, you're supposed to see an increase in gas mileage. How are you driving you car? I know when I drive fast, it's gone much faster than when I put it in cruise on the highway. I'm not a quarter down yet, and I've got 95 miles on the tank already. Not sure about this tank at all, just going to have to wait and see. I drive like a maniac.
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Marvin
-2000 Sentra SE w/Performance Package, Sunroof, 5 Spd, Avalanche
Future mods

R CAI, Stromung Cat-Back Exhaust System
-Previous Owner 1995 Sentra GXE, w/mods, Auto, Maroon