The Lundberg Survey of fuel prices released Sunday says the average national price of a gallon of regular is $3.18.
Analyst Trilby Lundberg found in the survey completed Friday that the average price for mid-grade was $3.32, and premium was at $3.43.
Diesel was up nine cents, to $3.59 a gallon.
Billings, Mont., had the lowest average price among cities surveyed at $2.95 a gallon for regular. San Francisco was the highest among surveyed areas at $3.54.
Fresno had California's lowest gas prices at $3.42 for a regular gallon.
