I run 93 and then 87 and so on. I save some money doing that. If I run 87 for two or three tanks I get pingings. I dunno why a 99 SE needs it, but it does ever since the Pro-M maf. Then again I am having it recalibrated, so that might solve the problem.

1999 Contour SE Duratec ATX My feet and the Stra�Ÿenbahn http://www.tempo-topaz-performance.com/topazsho/ the coolest Topaz ever! To bad it's not mine