Old gas can be disposed of where they recycle old oil. Oil, gas and brake fluid are all petroleum products and can be mixed together for recycling.
This is correct, at least in my experiences getting rid of contamination. In fact, just last week I had some old paint thinner, oil from my changes and some kerosene. When I got to the recycling center the BIG tank was full. The guy then told me to dump it in the Anti-freeze barrel as they suck it all out into one tank truck.
