CAMARILLO, Calif. (October 21, 2012)—The latest Lundberg Survey of fuel prices, released Sunday says the average price of a gallon of regular gasoline in the U.S. has dropped 8.5 cents over the past two weeks to $3.75.

Midgrade costs an average of $3.93 a gallon, and premium is $4.06.

Diesel dipped 3 cents to $4.15 a gallon.

Of the cities Lundberg surveyed in the lower 48 states, Tulsa, Okla., has the nation's lowest average price for gas at $3.26 while San Francisco has the highest at $4.51.

A separate survey by the auto club AAA put the national average price for a gallon of regular self-serve gasoline at $3.72 per gallon as of Friday, 9 cents less than week-ago prices and 13 cents less than month-ago prices.

However, AAA says gas prices remain 25 cents above year-ago prices and 39 cents below the record high set back in July 2008.