Hiya fellow Two Pedal Warrior!
Here is the scoop - pulled from here http://www.mx6.com/forums/2g-mx6-gen...2g-mx-6-t.html (How to activate hold on 2g mx-6 a/t?)
When the hold mode is on:
The transaxle is held in third, it automatically downshifts to second at a stop, however, and returns to third for smooth acceleration.
The transaxle is held in second. Don't drive faster than 101 km/h (63 mph) in this position.
The transaxle is held in first. Don't drive faster than 58 km/h (36 mph) in this position.
Shift-up patterns with hold mode on:
= 3rd (momentarily 2nd for standing start)
= 2nd (fixed)
= 1st (fixed)
I presume you know this, but if you don't - the auto tranny's that we have are considered amongst the crapiest out there. So, be nice on it if you want to push it from time to time.
I've chosen to use the Hold mode for breaking out onto the highway or straight lining with someone. The car can respond better from the shifting, but you can only really push from 1-2-3 kill hold then you get 4th. Too much work for too little gain.
I've learned to feather the accelerator - that allow me to "over ride" the auto tranny on it always shifting. Eg When I am on the highway, lets say I am on my way to go from 80-100km. Feathering the accelerator when the RPM is around 5K - the transmission will re gear giving the higher gear and the powerband really comes alive.
Hope this helps.