Hi Ironraven,
I believe 70/30 fuel is available from other suppliers, but you can proabaly burn other mixes no problem. When it is cold the butane burns poorly so the propane really helps, also keep the tank warm and insulated from the cold ground. Iso-butane mixes also burn better when it is cold. I have used many different kinds of fuel on my SnowPeak stove with no problem. I will check the web as there is lots of great information on cannister stoves from the ultralight backpacking crowd.
There was one type of Coleman cannister stove I remember that may have required it's own type cylinder, it may be called PowerMax?
Sounds like a great deal for $20.00
Mike