Gasoline prices have fallen below $3 a gallon for the first time since early this year, and the steady decline is expected to continue through the end of the year. Atlanta's average gasoline prices peaked in mid-May just shy of $4 a gallon, according to atlantagasprices.com, and have been trending downward since. "As of now, it looks like retail gas prices will fall throughout the end of the year," said Jessica Brady spokeswoman for AAA's Georgia branch.