I'd like to take my particular race fairly seriously. If it's a bout of pointing and laughing planned, I'm happy to camp somewhere else where I can be less affected and more controlled about my own...
Fingers crossed on this nugget drifting north :-/
Oh we use both, they are interchangeable but propane burns hotter and with a clearer flame than butane which is cooler and bluer.
Never mind, I'm sure that spare bottle is butane.