Gas prices slip - AAA survey
National average declines to $4.072 a gallon, down slightly from Sunday.
NEW YORK (CNNMoney.com) -- Retail gas prices have slipped, heading slightly lower after climbing late last week, according to a daily survey released Monday by motorist group AAA.
The national average price for a gallon of regular gas fell one-tenth of a cent to $4.072 from $4.073 on Sunday.
That's roughly 4% higher than last month and 36.5% higher than year-ago levels.
California has the highest gas prices. The price for a gallon of gas in the golden state averages $4.605. Alaska has the second highest average gas price at $4.552, followed by Connecticut at $4.369.
The lowest gas prices are in Oklahoma, where a gallon of gas averages $3.824.
The national average diesel price fell from $4.778 a gallon to $4.772.
Meanwhile, a separate survey released on Sunday found that the average price of gasoline rose nearly 10 cents over the past two weeks.
That survey showed that the average price was a fraction of a cent under $4.10 a gallon, said survey publisher Trilby Lundberg.
That was up 9.7 cents a gallon from when the survey was conducted two weeks ago, Lundberg said.
The Lundberg survey tallies prices from about 5,000 gas stations nationwide every two weeks. AAA gets its information from Oil Price Information Service, which tracks prices at about 85,000 stations daily. 
