My commute is about 22 miles (each way) and I always fully charge my PiP at home and at work before I leave. I have no choice but to always activate the ICE (switch from EV mode to HV mode) and burn some gas when driving in each direction. I do drive at slower city speeds at both ends of my journey (2 miles at each end) so there is more than enough EV reaiming such that I must use a lot of my EV when driving at 55 MPH. My question is: For what driving condition/circumstance would it be optimal to initiate my ICE's warm-up cycle (that, once started, can not be stopped until the warm-up period is complete)? 1) Should it be right before going up a hill or would that not be optimal? 2) How about turning it on (switching to HV mode) at one of the many stop lights on my journey (to me that would seem to waste the ICE power generated during the warm-up cycle)? Certainly there isn't too much to gain here... but I am always interested in finding ways to maximize my fuel efficiency.