A plentiful supply means lower gas prices.

FOX's Lisa Lacerra reports: 

Gas prices continue their down slide:

(Lundberg) "It's been 11 weeks now. Gasoline prices at the pump dropping. In this case, over two weeks it was just a penny and a half. But since April 21, the price is down 15 cents. The new price is $2.31 per gallon."

Oil industry analyst Trilby Lundberg, who says the price drop comes as suppliers have plenty of gasoline and crude oil.

Jackson, Mississippi with the lowest price at $1.92 and San Francisco with the highest at $3 a gallon.

Lisa Lacerra, FOX News.