I thought it sounded like a reed... It won't hurt it a bit, I've broken quite a few, (on average one set a year... out of 4 sleds that isn't too bad I guess) it's pretty common with vforce reeds. It'll just burn it up and spit it out the exhaust if it hasn't already, no need to worry at all.
Corey
Also... It's REALLY hard to tell if it's mixed or not. In premium it looks just like regular gas. It depends on your race gas too, what color it is to start with, blue, clear, etc.