PHILADELPHIA (CBS) – AAA puts this week’s national average for a gallon of unleaded gas at $1.96, but the question is, how low will gas prices go?

Folks in ten states are paying less than $1.75 and there are reports of a gallon as low as $1.42.

Some say low oil prices and large refinery capacity could drop the price to one dollar a gallon in some places; that has not happened since 1999.