The ECT power button just changes the shifting points of your trany. Basically when it is on it will downshift sooner and will not shift into a new gear as quick when taking off. When it is off it will shift into a higher gear faster to save on gas.

Can you use ECT power all the time?

I am sure there will not be any problems by running the ECT. EPA requirements require all manufacturers to make their engines low power for emissions. You should be fine using it all the time.

What does the ECT PWR button do?

ECT is an acronym for Electronically Controlled Transmission and the ECT PWR button is a function of the redesigned transmission. When pressed, the ECT PWR button will adjust shift points so you can reach higher RPM levels before shifting into the next gear.