200 miles per tank?!!?
I am a bit confused. My 300CE was doing easyly 320 per tank. Something is screwi now days, may be biger wheels or some sort of an engine problem but I am down to 260-240.
Your tank should be 18 galons and cars everage should be 19-20 miles per galon, that means 300 and above miles till the light comes on (16 galons of gas). You are everaging 10-11 !

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Dmitry
90' 300CE
17" Intra Signums
Brulen mufler
Euro Headlights/Clear Blinkers
White gouges (made my own)