that's what I do. One of the reasons I like this car so much.I drove my 2019 PHEV premium 500 miles from CA to AZ yesterday. I noticed that in cruise control in HEV mode that I did get a few miles of battery charge on flat ground. This was NOT in sport mode. I try to turn off EV for long trips so I have battery if I want to nap with the AC on. I usually forget for a few miles after each stop. At one point I had 11 miles remaining. I was at 14 remaining when I got here.