We have been having 86 to 90+ humid weather in WV lately and I have not seen a loss of A/C effeciency while in the ECO mode. I'm not sure why you'd run it in anything else. Then again I guess if you're really watching the screen closely and if you notice that the ICE is driving both the wheels and charging you could switch the ECO off and utilize the excess hp from the ICE to drive the A/C and save some of the discharge from the battery. I'm not sure what that would really help but I guess someone on here will.

I'll continue to drive in ECO.