The kelly kettle works well. If you'd got/get up early enough you'll seen mine in use at the Dragon. They are quicker than some petrol stoves and you should never have fuel issues. That said, I rarely use it as they do in the adverts. Options are:
1. Use it like a normal kettle on the stove and have boiling water faster.
2. Stick it on an open fire or BBQ and have hot water quickly, plus it'll draw the fire and you'll be stewing/roasting/grilling sooner.
3. Chuck a hexamine tab in the ashtray, this working faster than;
4. Start the fire with paper, a copy of the Sun being good for three or four cuppas but also getting the heat and draught going to;
5. Burn chips of dry fire wood, these burning easier than;
6. Bashed up charcole which is messy and slow to get going and;
7. Twigs which are never dry and hence hard to burn. The ones on the adverts are probably imported from Arizona, I've never had any with a smoke:heat ratio better than 99:1.
Sand soaked petrol is one for suicidal survivalists

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They come in a bag for a reason, mine is a sooty mess.
I'm starting to view the stove as part of system. The Kelly kettle gives me means to have a cuppa and warm my hamds in a not too shabby time period. The bucket BBQ cooks my tea and gives the usual warm hands and something to poke on dark nights. The stove is there for places where fires aren't allowed or days I don't want stew or dead cow. I guess this is one of the advantages of an outfit, weight and size ceases to be a real issue. My days of "ration pack 1 person 48 hours, meat and beans plus coffee Nato, vomit induction and causing Diabetes, for the use of" are well past. If all you plan to do is heat beans, the little Swedish cook sets work pretty well IMHO.
Andy