Well the Zetec is temp sensitive. Running at the track it was at least 3 tenths difference when the car was cool and when it was running at normal temp.
Hector
2003 Rally Red Mitsubishi Evolution VIII
257HP/259TQ
2005 Lapis Blue Mazda 6s
RET: 00 Cabernet Red Ford Contour Zetec ATX SUPERCHARGED
160HP/141TQ