I had to drain my tank, and had about a gallon extra that I put in an ice cream bucket. It lit up right away and burned for a solid half hour. Tossed a couple magazines in for good measure, but I wouldn't recommend pouring more on a burning flame. It's a recipe for disaster. Also trying to extinguish an e85 fire with your foot doesn't work. Spreading it around doesn't work either. The fire just gets bigger. I had poured maybe a cup's worth onto a pile of ash I had and lit it with a stick from the other fire. It would not go out. So if you are in fear of a fire like this, get an extinguisher rated for that sort of thing. And if it's in your house, you might want to call the fire department.
http://www.youtube.com/watch?v=8-oYgB4eus8&hd=1