range extender cold

Good afternoon Yall, 2017 Volt owner for about 2 months. It was 36 degrees this morning and I decided before leaving, I would try to precondition the car. I started it with my OnSTAR app and 10 minutes later when I got in, it was toasty warm. The car was plugged in all night with the 240V...

I wonder whether it is possible to over-ride the generator on cold mornings. I commute to work at four in the morning. Recently, it was single-digits for several weeks when I left home. The range extender gasoline generator burns almost one-tenth gallon of gasoline, running my fuel economy...