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The information provided in all Mexican pages are only suggestions and anecdotal stories.  The information in the Mexican pages is a generic peace of work and is meant only as a general guide, it should not be taken as absolute fact. The information provided in these pages can change at any given day. 

Propane

Mexico actually has Butane rather than Propane. It burns the same with no adjustments necessary to your heater, or stove. Bulk plants are located outside the city limits (sometimes miles away) always along side a main highway. Bulk trucks (delivery trucks with a pump and meter) are becoming more common, but usually 25 gallon cylinders are hauled around on the back of flatbed trucks. Huge tanker trucks haul the butane down from the USA, where it is purchased to refill the bulk plants.

When sold by the kilogram, two Kilograms of gas equal one gallon of liquid and vapor.

Don't try to haul a full load of Butane back to your home if you live in cold country. It won't flow in sub freezing temperatures. Half a tank mixture of Propane and Butane will work OK down to zero Fahrenheit.

Motor Fuel

Bulk plants are allowed to charge more for Butane used as motor fuel. The surcharge is about 20% but it varies widely from place to place.  Bulk trucks will fill up your motor fuel tank, and they usually split the difference between motor fuel and domestic fuel prices. This is usually done "around the corner".

Some Plants Don't Have Meters

Mexico is still not used to odd size gas tanks. At the bulk plant, scales are used to measure sales in Kilograms. If your tank is portable then weight added to it, will be charged as gas. Tanks mounted in vehicles present an unknown as far as quantities are concerned; they can't weigh the tank. Clean off the specification tag that's glued onto your tank. It'll have the gas capacity (usually water capacity) which the attendant will refer to for determining the quantity needed to fill it. Ask for a presupuesto (estimate), of liters needed to fill your tank (four liters are 105% of 1 gallon). Most employees are honest but many are not skilled in math. It's best to establish your tank capacity before the time comes to argue with the attendant.

Overfilling The Tank

If your tank is inadvertently overfilled (white vapor escapes from your 10% valve when cracked), you'll need to bleed the tank until clear vapor replaces the white. Do this at the plant, but over to one side where you won't block other customers.

No Fires Permitted

Mexican bulk plants are equipped to dispense motor fuel gas to vehicles that have "Fast Fill" fittings (the same fitting as used throughout the United States and Canada). Bleeder valves and vapor escape hoses are non-existent. When plant personnel loosen the connection after filling raw liquid escapes copiously. Therefore extinguish all potential sources of ignition before driving up to the dispenser.

Needless to say, a fire in a gas plant is very dangerous. Employees are cavalier with dispensing hoses, sometimes allowing them to shoot gallons of fuel around while depressurizing hoses and lines. Before you enter the yard SHUT OFF THE GAS VALVES TO YOUR HOT WATER HEATER, TO YOUR REFRIGERATOR AND THE MAIN TANK VALVES. Don't restart the appliances until after you have fueled up and until you have exited the bulk plant.