That makes sense. I drove my mom to the dentist because she was having some minor surgery and she didn't want to risk not being able to drive back. Anyway, the procedure took a little over an hour and because of the location of the dentist it only made sense for me to wait there. It was quite hot so I decided to learn the Niro more so I turned it on to have AC and I noticed the engine actually ran very little. The Niro is quite a neat vehicle.In that scenario, you are better off leaving the car "on". The one time I tried it, about 90 seconds of engine time every 10 minutes to keep the 12 volt battery charged.