U.S. gas prices have risen an average of 25 cents a gallon over the last two weeks, according to the Lundberg Survey of fuel prices. 

The national average price of a gallon of regular gasoline is now $3.59, midgrade is $3.75 a gallon, and premium is $3.89.

A gallon of diesel costs 12 cents more than it did two weeks ago, climbing to an average of $4.07 gallon.

The Lundberg Survey found that Los Angeles, CA has the highest gas prices, averaging $4.05 a gallon. Billings, MT had the lowest average gas price at $3.05 a gallon.

Gas prices have risen steadily under President Barack Obama. On the first day of Obama's presidency, the average price of a gallon of gas was $1.84.