Twenty years ago I bought two cans of Coleman fuel and still have about 1/2 a can left and it still works great. I have my parents Coleman two burner stove and their lantern from the mid 50's and my x fatherinlaws lantern from the early 60's and they all work like brand new. I also have his three burner stove that I bought one of those propane converters for and that thing heats like a blow torch.
Veebyes, I do know about those lantern torches as I unscrewed the filler cap one night instead of the pump while it was lit. :S The flame was about 6-10 feet and the smell of burning hair from my arm was bad.:o