Gas prices are dropping across the US. Why now? Which states could hit $3 per gallon?

After the national average for gas surpassed $5 per gallon in June, U.S. drivers are finally finding some relief at the pump. But how low could prices go?

A handful of Southern states are inching closer to $3 per gallon, and oil futures are predicting gas below that in some regions. But experts warn that the market faces factors that could again spike prices.