Do you warm up camper before heading out for winter camping?

Depends...how cold is it?
How well insulated is your camper?
How warm do you like to set thermostat?

A full tank in temps ranging from teens deg F and up may last us about 3 days or so, running water heater and fridge also.

I would say 2 tanks would last a week in cold temps.

We are usually our all day skiing/hiking/snowshoeing so heat is very low durring day.
We like it warm at night 68 deg F or so...

B