The average U.S. price of a gallon of gasoline has increased 18 cents over the past two weeks.
The Lundberg Survey of fuel prices on Sunday put the average price for a gallon of regular at $3.69, about 8 cents higher than the same time last year.
Nationally, a gallon of mid-grade averages $3.84 and premium $3.96.
The price increase is due to the high cost of crude as well as the partial loss of production at the Chevron refinery in Richmond. A massive fire shut some production down last Monday night.
Tucson, Ariz., has the nation's lowest price at $3.18, while Chicago had the highest at $4.23.
In California, the price rose 23 cents per gallon to an average $3.99 for regular.
Fresno had the lowest price, $3.83 for regular, and San Francisco had the highest, $4.06.
So far this year, gas prices peaked at $3.96 a gallon back in April
