updated 11/23/2008 7:20:41 PM ET 2008-11-24T00:20:41

A national survey shows gas prices across the nation dropped to less than $2 a gallon for the first time since March 2005.

The average price of a gallon of regular gasoline at self-serve stations was $1.97 Friday, falling 33 cents over the last two weeks. Mid-grade was at $2.12 and premium was at $2.24.

That's according to the Lundberg Survey of 5,000 gas stations nationwide, released Sunday.

Diesel was at $2.93, the first time it fell below $3 per gallon since September 2007.

Gas was cheapest in St. Louis, at $1.89 for a gallon of regular. It was most expensive in Honolulu, at $2.81.

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