The average U.S. price of gasoline has dipped 3.5 cents a gallon in the past two weeks and prices in California have fallen nearly 8 cents in the same time period.

According to the Lundberg Survey released Sunday, the average nationwide for a gallon of regular is now $3.31. Midgrade averages $3.50 and premium is $3.65.

Of cities surveyed in the Lower 48 states, the lowest price, $2.94, was in Billings, Mont.

San Diego, Calif., had the highest price at $3.60.

In California, prices for a gallon of regular dropped nearly 8 cents to $3.54.

The average price per gallon in Nebraska is $3.11.