The 6 V6 5 speed, I've tested with the CD player to measure times. (all be it kinda not accurate, but it is close) The time I got was mid to high 6's.
The auto 2.5's are slow, but not that slow. My moms car is a 2.5 Mistique, and I say it gets to 60 in a little over 8 seconds

Mazda 6S, V6, Speed Yellow 5 Speed, Sport package Bose audio Painted 'stash and HIDs! w/Injen 1/4 14.750 @ 94.94 Former car: 99 Contour SE Sport Black MTX V6 SVT plastic... 1/4 - 15.012 @ 90.58