i ran leaded 110 in a 50/50 mix for a couple weeks and the car ran great(less kr), but shortly after that i replaced my factory o2 sensor

and this is what it looked like.
http://webpages.charter.net/rkneibert/GTP/12.JPG

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2001 blk/blu GTP Sedan
3.4/XS-headers/Thrasher CAI/3EP trans/B+G