By Jonathan Stempel

June 22 (Reuters) – Gas station operators including BP, Circle K, Marathon Petroleum, 7-Eleven, Walmart and Albertsons were sued ‌on Monday by California drivers who accused them of using ‌artificial intelligence to boost prices at the pump.

According to a proposed class action, the ​defendants violated California’s main antitrust law, the Cartwright Act, by using an AI-based tool that uses data from competing gas stations to “coordinate high prices and wring more money from the pockets of consumers.”

The lawsuit in ‌the Sacramento, California federal court ⁠said the scheme violated Assembly Bill 325, a California law that took effect on January 1 and was ⁠intended to crack down on algorithmic price fixing.

Drivers said gas prices have risen as much as 30 cents a gallon in areas where high ​percentages ​of stations use the AI tool, ​which comes from a company ‌called Kalibrate.

Each penny costs California drivers an extra $134 million per year, boosting gasoline prices to “astronomical” levels sometimes reaching $7 a gallon, the complaint said.

“While families struggle to afford the commute to work, defendants have conspired to put an end to competition, joining an AI-powered trust to ensure ‌that no matter where a driver turns, ​the price for gasoline is artificially high,” ​the complaint said.

The defendants ​operate more than 1,700 gas stations in California, according ‌to the complaint. Kalibrate is also ​a defendant. The ​defendants either did not immediately respond to requests for comment or declined to comment.

Californians pay the nation’s highest gas prices, averaging $5.58 ​per gallon for ‌regular, according to AAA. The national average is $3.93.

The lawsuit seeks ​unspecified damages for drivers who paid too much for gasoline.

(Reporting ​by Jonathan Stempel in New York)