Whynter 12v refrigerator vs 3 way refrigerator

DrewE wrote:
I would guess maybe you could get a month from a 20 lb bottle under decent conditions, but that's just a guess.

A small 1.7 cu ft gas absorption fridge with a burner flame that runs 24/7 will be rated at ~ 625 BTU/hr, which in turn means a 20 lb tank would keep that fridge running for about a month. Logically a larger capacity fridge such as the OP's 4.3 cu ft fridge would consume gas at a much greater ... that being the case a 20 lb tank would run dry much sooner.