A survey says the average price of a gallon of regular gasoline in the U.S. has risen by 2 cents over the last two weeks to $3.71.
Industry analyst Trilby Lundberg said Sunday that crude oil prices rose over jitters about Iraqi oil production as violence there grows.
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Much of that increase hasn't been passed on to consumers yet, and prices could increase over the coming weeks.
The survey taken Friday shows the average price for a gallon of midgrade gas was $3.90 and the average price for a gallon of premium was $4.05. Diesel averaged $3.95 a gallon.
Of cities surveyed in the continental U.S., Tucson, Arizona, had the lowest average price at $3.37 a gallon. Chicago had the highest average at $4.15 a gallon.