On Thursday, January 10, 2013 11:29:18 AM UTC-5, Harry K wrote:
I'm still wondering if, lacking a spark, gasoline vapors would ignite. Harry K

I'm inclined to think not.

Flash point for gasoline is - 50 F, but flash point is the temperature at which a spark or flame will ignite it.

Autoignition temperature is + 495 F, and I doubt we'll see that in a microwave.

But I'll let mythbusters test it.