When I was living in Alaska back in the late 70's & 80's we use to go "to the field" all the time. Druing the winter we had skis on the helis. Imagine my Cobra with skis? So we lived in tents with Yukon stoves. We could never rely on the fuel trucks to make their rounds on time to refill our 5 gal cans.

So when it appeared they were not going to be around any time soon and we needed fuel, we'd dig a trench out from under the heli and drain out 5 gal of JP4 and be done with it. Aviation units always kept warm.