(CNN) -- U.S. gasoline prices topped out Monday at $3.50 per gallon for self-serve regular, according to AAA -- the highest average price the national auto club has ever recorded.
The cost inched up from Sunday's $3.49. A month ago the reading was $3.26 a gallon, and a year ago it was $2.85.
California had the highest average price -- $3.86 per gallon -- and Wyoming had the lowest -- $3.39.
AAA's data is obtained from the average of the last credit card swipe at about 85,000 gas stations on the previous day. Another survey, the Lundberg Survey, is carried out every two weeks at about 5,000 gas stations, and it, too, hit a record high.
The latest survey, conducted Friday, put self-service regular gasoline at $3.47 per gallon, 15 cents higher than the previous record set in the survey two weeks earlier.
Publisher Trilby Lundberg blamed the increased prices on higher crude oil and ethanol prices. She said she does not expect the prices to go down anytime soon, especially as gasoline demand goes up in the spring and summer.
The cheapest gas on the Lundberg Survey could be found in Newark, New Jersey, which had an average price of $3.21. Drivers in San Francisco, California, where the average price was $3.88, paid the most.