The average price of regular-grade gasoline fell half a cent nationally over the past two weeks to $2.40 a gallon, analyst Trilby Lundberg of the Lundberg Survey said on Sunday.
However, Lundberg said that gas prices actually rose in several Western and Midwestern cities. A sharp decline in the rest of the country kept prices down overall.
Lundberg says the average price is nine cents higher than it was a year ago.
The highest average gas price, $3.10 a gallon, was in the San Francisco Bay Area. The lowest, $2.02 a gallon, was in Jackson, Mississippi.
Lundberg said that crude-oil prices rose during the previous two weeks, but that retailers have been slow to pass those increases on to consumers.