California Drivers Sue Walmart and BP for Allegedly Using AI to Inflate Gas Prices

California already has the most expensive gasoline in the country, but a new lawsuit claims prices have been pushed even higher by artificial intelligence. On June 22, 2026, a group of drivers filed a class action in Sacramento federal court accusing six of the state’s largest gas station operators of using an AI pricing tool to coordinate fuel prices across more than 1,700 stations. The allegation: a secret algorithm has been draining billions from California wallets.

The Companies Named in the Suit

The defendants include some of the most recognizable names in American retail and fuel: BP, Marathon Petroleum, 7-Eleven, Walmart, Circle K, and Albertsons. Together, they operate a sprawling network of filling stations across California. Also named as a defendant is Kalibrate Fuel Systems, the British software company whose AI pricing platform sits at the center of the allegations. None of the defendants agreed to comment on the lawsuit. 

How the Algorithm Works

The Kalibrate Fuel Pricing platform connects directly to gas station signs and pumps, automating price decisions based on competitor data. According to the complaint, gas stations surrendered their confidential cost and volume information to the software, which then generated pricing recommendations across competing outlets. The system automates roughly 80% of fuel pricing decisions, reducing the need for human input. Plaintiffs argue this effectively removed any real price competition between the named operators. 

What Drivers Actually Paid

The financial toll on California consumers is substantial. The plaintiffs claim the algorithm pushed gasoline prices up by as much as 22 cents a gallon and diesel by 33 cents above competitive market levels. In some areas of the state, prices already crested $7 a gallon. Every additional penny per gallon costs California drivers a combined $134 million per year, making the alleged pricing scheme one of the most consequential consumer cost disputes in the state’s recent history. 

California’s Gas Price Problem, Amplified

Even without the alleged manipulation, California’s fuel costs dwarf the rest of the country. According to AAA, Californians pay an average of $5.58 per gallon for regular gasoline, compared to a national average of $3.93. The state’s higher taxes, strict environmental fuel standards, and geographic isolation from other refining regions already inflate pump prices. If the lawsuit’s claims hold up, those structural costs were further compounded by coordinated AI-driven pricing across a dominant share of the market. 

The Law Behind the Lawsuit

The case rests on two legal foundations. The first is California’s Cartwright Act, the state’s main antitrust statute. The second is Assembly Bill 325, signed by Governor Gavin Newsom on October 6, 2025, and effective January 1, 2026. AB 325 prohibits the use or distribution of common pricing algorithms that incorporate competitor data, even when that data is publicly available, and creates liability for coercing others to adopt algorithm-recommended prices. The gas station lawsuit is among its first major tests. 

The RealPage Precedent

The gas station case did not emerge in a vacuum. AB 325 reflects a national wave of antitrust scrutiny of algorithmic collusion, gaining momentum from the U.S. Department of Justice’s August 2024 lawsuit against RealPage, a real estate software provider accused of enabling landlords to align rents through a shared AI pricing tool. California lawmakers modeled AB 325 partly on that case. The legislation was designed to ensure that digital tools cannot be used to circumvent longstanding antitrust protections. 

Kalibrate’s Defense of Its Platform

Kalibrate has not publicly addressed the lawsuit directly, but its published materials push back on the core premise. The company argues that each client operates with its own pricing models and rules, meaning two retailers using the same platform would still arrive at different prices based on their individual strategies and market conditions. The company also holds seven patents on its data science methods. Whether courts accept that framing, or treat the shared use of competitor data as illegal coordination regardless, will shape the outcome of the case. 

A Landmark Test for AI Antitrust Law

Legal analysts say the outcome could set precedent well beyond the gas pump. The case is one of the first filed under AB 325, and its outcome could determine whether AI vendors share antitrust liability alongside the operators who use their tools. The plaintiffs argue the law was enacted to make clear that companies cannot evade liability for price fixing by delegating the arrangement to an algorithm. If courts agree, the implications would ripple across every industry where shared pricing software is standard practice. 

The Price of Algorithmic Competition

The California gas lawsuit captures a fundamental shift in how price-fixing works in the modern economy. No executives met in a back room; no calls were recorded. A shared algorithm, fed by confidential competitor data, is alleged to have done the coordinating automatically. With 1,700 stations named, $134 million in annual costs per penny of overcharge, and a new state law designed precisely for this scenario, the case represents the most direct collision yet between AI-driven commerce and American antitrust law.