CAMARILLO, Calif. (AP) -- The latest Lundberg Survey finds the average national price of gasoline rose nearly 12 cents in the past three weeks. That marks the first price hike after six months of steady decreases.

The average price of regular gasoline Friday was $1.78 a gallon. The price of mid-grade was $1.91 a gallon and the price of premium was $2.02 a gallon.

The increase was the first since July 11, when the average national price peaked at $4.11 a gallon.

Of cities surveyed, the nation's lowest price was $1.34 in Billings, Mont. The highest price was $2.32 in Anchorage, Alaska.