I read that the 2019 will now use the ICE to generate heat instead of "exhausting the battery first". Does anyone know the details on what this means? I bought my 2018 at the start of the summer and now that the colder weather is upon us I'm curious to see how the Volts heating system works. I understand ICE heating well, but not the electric heating in the Volt. Is the 2019's behavior preferred / better?