I did test out the manual shifting theory on back to back runs in the spring. I rean .4 seconds faster manually shifting than leaving the car in D with the o/d off.
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