The average price of a gallon of gasoline nationwide has dropped seven cents over the past two weeks.

That’s according to the Lundberg Survey of fuel prices, which puts the price of a gallon of regular at $3.85.

Midgrade costs an average of $4.00 a gallon, and premium is at $4.12.

Diesel dropped three cents to $4.15 a gallon.

Of the cities surveyed, Tulsa, Okla., has the nation’s lowest average price for gas at $3.40. Chicago has the highest at $4.32.