Diesel is a good alternative for international travel due to the LPG cylinders and fittings not being standardized through even neighboring countries. Some areas require you to exchange cylinders and not refill the one you have and they won't trade your cylinder in as it is different. Some cylinders are even different shapes / sizes - so they may not fit the compartment or brackets of your previous cylinder. Diesel avoids these issues.
If you are just planning north american travel (US / Canada / Mexico) then I don't think there is much of an issue with LPG / Propane.
Boaters don't like to use propane because it is heavier than air and it can fill up the hull and explode since it settles in low spaces and displaces air. They have similar challenges getting LPG cylinders refilled also.
I am against any forms of gas because of the explosion factor, especially on bumpy roads and whatnot, as well as having troubles with border crossings. I know for sure lpg is out of the question.
How many on the trail who might can help will have a clue where to look for alcohol fuel shut off.Class B fires involve flammable and combustible liquids such as gasoline, alcohol, oil-based paints, lacquers. Therefore, extinguishers with a B rating are designed to extinguish fires involving flammable and combustible liquids.
Note: Do not attempt to extinguish a fire involving flammable gas unless there is reasonable assurance the source of fuel can be promptly shut off. In fact, if the only fuel burning is the leaking gas, the best method for extinguishing the fire is to shut off the fuel supply. Extinguishing a flammable gas fire, without shutting off the fuel, will allow unburned gas to escape into the atmosphere, which may permit a dangerous accumulation of gas to develop, and an explosion may occur if the gas is exposed to an ignition source.