For us with automatics, do you use the ECT PWR button or no? My understanding is E(lectronically) C(ontrolled) T(ransmission) takes away the line pressure requirement of shifting and just follows a trim table.

Has anyone compared performance with/without? Fuel mileage?

 

I like the way it holds a gear longer and kicks down sooner with ECT on, but I'm running 275/70R17 with 4.30 ratio and a lift so milage is already diminished and I need a bit more revs between shifts with the large hills in my area.