Propane for homes costs $2.25 gallon here only it is mostly BUtane in warmer climes. Since Mexico started importing Super Shell as PREMIUM Pemex, there is no need to think of using an alternative motor fuel. Gasoline costs $3.60 US gallon.
Until (hahahahahaha) a constitutional amendment is adopted forbidding the export of petroleum except via NAFTA, the oil companies are going to continue to play the pea and walnut shell game with petroleum products.
An obsolete 40 pound pot* or 100 pound cylinder heated to 30 degrees warmer than the empty vessel will gravitate propane so fast from vessel to vessel it would make a person's head swim. *The recipient vessel nor the donor vessel can be OPD devices. A male POL fitting on both ends, using liquid LPG motor fuel hose to take the pressure. But OPD vessels again, cannot be used. Paint the donor vessel flat black. Shade the recipient vessel.
My LPG bill now averages about fifty dollars a year. Electrical is minimalist. At .05 kWh for the 1st 150 kWh it costs me thirteen dollars for TWO months.