Can you heat a Class B motorHome the sam way as a car.

To heat it "like a car" requires you to run the engine, which will consume more gasoline than any generator. Also, you will destroy your engine if you run it for long periods of time at idle. Gasoline engines are not designed for that.

The cheapest way is to put some extra clothing on and use a propane heater off and on through out the day. You can not leave it running 24 hours a day.

I just made it through the winter using a portable propane heater in my van. I spent about $20 on propane since October (6 months)