The price of a gallon of gasoline continues to climb, rising an average of 17 cents over the past two weeks.

That's according to the national Lundberg Survey of fuel prices.

Analyst Trilby Lundberg says the U.S. price of regular grade gasoline was $2.66 a gallon on Friday when the survey was completed.

The price of mid-grade was $2.78 and premium was $2.90.

Tucson, Ariz., had the lowest price, at $2.41 a gallon for regular. San Francisco had the highest at $2.99.

For all of that, Lundberg points out that gas prices are far lower than they were a year ago at this time.