Electronic Controlled Transmission, normal mode is just that, normal. Power mode changes the shift points it will downshift with less throttle and hold each gear alot longer. Meant for towing or mountain driving, I find it more useful for driving in the city too or traffic. Plus I think my 4runner with the 2.7 gets better mpg with the tranny in pwr all the time.

04' Ford Ranger XLT 4.0l (Mr. sensible)

There are 10 kinds of people in this world that understand binary, ones that do, and ones that don't.