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CAMARILLO, Calif. (AP) - U.S. gasoline prices continue to fall, dropping an average of 15 cents per gallon over the past three weeks.

Industry analyst Trilby Lundberg says the average price of regular is now $3.22 per gallon.

The average for midgrade is $3.42. For premium it is $3.57.

Of the cities surveyed in the Lower 48 states, the highest average, $3.67 a gallon, was found in San Francisco. The lowest, $2.82, was in Tulsa, Okla.

The average price of diesel fuel declined 4 cents a gallon, to $3.87, since the last Lundberg Survey.

(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.