AI-powered software has allowed gas station operators across California to illegally collude and drive up prices at the pump, according to a federal lawsuit.

The proposed class action lawsuit, filed Monday, accuses gas station giants including Marathon and Circle K of violating California’s antitrust law through Kalibrate, a fuel-pricing software system used across the world. The plaintiffs describe Kalibrate as the “central nervous system for a conspiracy to extinguish retail price competition among gas stations.”

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