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A new lawsuit accuses a slew of gas station owners in California, including Walmart, Speedway and Albertsons, of using an AI tool developed by a company called Kalibrate to artificially inflate prices at the pump—causing prices to surge in the Golden State.

The suit, filed on Monday in a federal court in Sacramento and first obtained by Bloomberg, accuses the companies of using Kalibrate Fuel Pricing—a tool the plaintiffs claim requires gas stations to hand over cost and volume data to the company, which then makes pricing decisions for them.

However, the plaintiffs allege this allows the stations to “avoid competing with other area stations and to charge higher prices to consumers.”

The suit also alleges Kalibrate has a feature called “restoration,” which allows most stations in a market to “contemporaneously implement large price hikes.”

In areas where a large number of gas stations are using Kalibrate, gas prices could artificially rise as much as 30 cents more per gallon, according to the suit.

The suit named Kalibrate’s parent company Knowledge Support Systems, as well as several gas station operators who it claims have used the system in the past.

Kalibrate did not immediately return a request for comment from Forbes.