Why are you using 93 octane? Have a tune or some other reason? Unless you have modified your car with a tune going with a higher grade fuel us just wasting money.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)