I would go with a refrigerator that runs on propane if I already had a propane tank to run a stove on or get a refrigerator that runs on kerosene if I had no propane. The good thing about propane is that it never spoils like gasoline and diesel. Here http://www.bensdiscountsupply.com/servelrefrigerator.aspx the Servel propane or kerosene refrigerators are $1,296.00 for propane or $1,789.00 kerosene so they are quite expensive but in a grid down collapse it might be worth it. You might be able to salvage a propane refrigerator out of a junked RV.