Did I just get suckered?

This guy is tiny, the whole package, less fuel, is about 2.5x2x5x1 and very light. They had them on sale for $20 at my local Wallyworld, there was a note about "inventory prep" so it looks like they just wanted them gone.

Then when I got it home, I noticed that Colman uses a 70/30 mix of propane and butane. I've never really paid much attention, being an ethanol and woodchip stove user mostly, but is that the normal mix? Or is it a screwball blend?