Question: To dispose of gasoline safely,
Option 0: contact your local recycling authority.  Some recycling centers will accept gas and recondition it or recycle it safely.  If they don't, they will direct you to someone who will.
Option 1: contact your local recycling authority.  Some recycling centers will accept gas and resell it or recycle it safely.  If they don't, they will direct you to someone who will.
Answer: 0