Clarence Vaughn, pumps gas in Oak Park, Thursday, Jan. 31, 2019. (Antonio Perez/Chicago Tribune)

       CAMARILLO, CALIF. — The average U.S. price of regular-grade gasoline dropped by 6 cents over the past two weeks to $3.41 per gallon.

       Industry analyst Trilby Lundberg of the Lundberg Survey said Sunday that prices have been falling for a month due to lower crude oil costs.

       Nationwide, the highest average price for regular-grade gas is in the San Francisco Bay Area, at $4.77 per gallon. The lowest average is in Houston, at $2.83 per gallon.

       AAA pegs the nationwide average at $3.31 per gallon as of Monday, while the Illinois average is $3.41. Chicago and Cook county have some of the highest gas prices in the region, averaging $3.65. The region typically ends up on the higher end of the national average because of higher state and local taxes.

       According to the Lundberg Survey, the average price of diesel is $3.65 a gallon, down 3 cents since Dec. 3.

       Contributing: The Tribune’s Lisa Donovan

       Average US gas price fell 6 cents to $3.41 per gallon; Chicago area at $3.65

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