Proper gas users use propane, which can be used all year round, unlike those who use butane gas which does not work when it is cold. Plus, the Calor gas propane bottle uses the same regulator connection as the USA BBQ's. How convenient is that??
The only other gas I know of comes in green bottles for use in those expensive patio hair dryers favoured by the Chelsea crowd.
Where the gas referred to by some of the charcoal dinosaurs is used escapes me - sorry, it's the garlic again!!
Of course, the intelligensia of this forum will already know all this!