Add two cans of Heet and burn it

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Hello from Atlanta, GA. I have an old gas tank with 4 gallons of old,
varnish smelling gasoline that I wish to properly dispose of. Is there
an environmentally responsible way to get rid of this? Oil recyclers
will not take it, I cannot find anything to add to it to render it safe
and inert, a friend at EPA said there are no guidelines for the proper
disposal of old gasoline. Suggestions?
Regards,
Mike Nichols
2--'81 air cooleds

Fred