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Stoves, stability, don't let the bottle over heat, fill away from naked flames and flammable things like tents. If you must cook in the door way of the tent then make sure you can easy get to the other door e.g. no kit in the way or have a sharp knife handy to cut your way out of the burning tent through the side if necessary. In the third world petrol may have rust in it so fill the stove with funnel that has a fine mesh.
Fuel types, these can be defined as gas, liquid and solid fuel. Liquid fuels methylated spirits (meths) pro's can be burnt directly in stoves without the need for pressuring or priming. The stoves that use meths don't need any moving parts and so are easy to use. Con's its difficult to see the flame and so re-fuelling can be dangerous because the fuel bottle may ignite. Meths only gives out half the heat of the other fuels so you will need twice as much fuel. Its very difficult to buy this fuel in Europe, in France for example you have to get a licence from the police station to be able to buy it then you have to find a chemist that sells it and generally you can only buy 1/2 a litre.
Paraffin, pro's burns the hottest of all the liquid fuels, con's paraffin needs to be pre-heated and pressured. To pre-heat the stove you will need to carry a small quantity of some other fuel such as meths. If spilled paraffin leaves a greasy stain that is difficult to remove. If you can buy paraffin for lamps (lamp oil) rather than the sort for heaters as it will burn cleaner and won't block jets in the stove. The reason for this is that the lamp oil is designed not to blacken the glass of the lamp. Aviation fuel refined paraffin really and can be used in stoves without the jet blocking problems of ordinary paraffin but it is difficult to buy in the developed world.
Petrol pro's widely available con's difficult to buy in small quantities, highly flammable so great care required, the additives in it will eventually block the jets in a stove and so it will need to be cleaned from time to time. It is possible to buy petrol designed for stoves called Coleman fuel but it can be difficult to find, it also costs a lot more than petrol. Diesel pro's easier to find in the undeveloped World than other liquid fuels. con's difficult to buy in small quantities, needs pre-heating and pressurising before it will burn. It produces a smelly and sooty flame that will eventually block the jets in a stove. Blue gas widely available doesn't work if below freezing, butane freezes so go for a butane / propane mix. Insulate it from the ground use a wind shield and a lid on the pot to save fuel. Solid fuel stoves e.g. hexamine in my experience testing these against other stoves and fuels these will boil a pint of water faster any other. No moving parts or priming required. poisonous fumes, how to use. This solid fuel comes in a packet with 8 blocks in it. If you use it correctly 1 block will boil a pint of water. If you break the block into smaller pieces then it burns hotter and faster. The reason for this is that the smaller pieces increase the surface area and thereby the burning area which means more heat. To boil a point of water quickly use two blocks broken into small pieces. To use these you must shield the flame from the wind just like other stoves, either by using a fold away wind shield, rocks or digging a small hole. Remember that water will boil faster if you put a lid on the pot. These stoves are good to carry for emergencies to make a hot drink. But you can only make a hot drink if you have water. If you don't have any with you then you'll need to get some from a stream and on the tops of mountains especially rocky ones there aren't any streams, so emergency stoves are only worth carrying if you will be near water most of the time during your walk or your escape routes will take you past water.
Open fires, environmentally its better not to.
Pots, lids, don't fry boil only. Use lids its stops the heat escaping and saves fuel. Rub the bottoms / sides with soap or washing up liquid it makes them easier to clean once the stove has blackened them.