I am planning on needing to use the ICE a bit more in the coming months, and I am wondering if anyone has insight/information/knowledge about the efficiency (or inefficiency) of the ICE when charging in HV charge mode. Specifically, does anyone have any idea how many kWh are generated, for example, per gallon of gasoline? Also, does the ICE charge the battery at a constant rate, or is it variable, for example, based on the speed you are driving or other factors? Any other tips for driving in HV charge mode? Thanks in advance.