Well, the darn thing sure works well. I sat there this morning, temps around
40*, with the slider wide open and the Mr Heater on in the doorway. Kept it
nice and toasty. Seems like a good auxiliary heater if no more.

Maybe a canary in the van would help...

12 v blankets seem like a great idea, too.

Hard to justify an expensive heater for a car that only cost $1900. I'm
going to stick with the Mr Heater but only use it when not sleeping and with
plenty of ventilation...and when by myself...

Thanks to all.