California is famous for plenty of things, but few grate quite like its fuel prices, which already rank among the steepest in the nation. As of today, regular runs $5.56, mid-grade $5.788, and premium $5.95. Now a group of residents claims the state’s major station operators have been leaning on shared pricing software to coordinate what they charge at the pump, potentially skimming millions from drivers one penny at a time.

If the claims hold up in court, the case could become one of the most significant legal tests yet of AI’s growing role in setting prices.