Here in Hawaii each island is its own county with its own rules. I'm on the island of Hawaii, the Big Island. I've been on the phone with government agencies and am awaiting a return call from Honolulu on the island of Oahu.
Apparently there is no existing program on this island for old gas. There are 2 hazardous waste days per year for other stuff including automotive fluids.
The guy in Honolulu is trying to find a waste oil business locally that might take my gas.
I have 3 vehicles with a total of less than 20 gallons of gas that has turned punky. 12 gallons is ethonal free, about 2 years old and the rest is older with ethonal.