Two California residents have filed a lawsuit on Wednesday against the US coffee chain Starbucks, claiming it knowingly under fills its lattes. The plaintiffs claim that the coffee chain has been cheating customers for years to counter the high cost of milk. A Starbucks company spokesman said they've been aware of the plaintiffs' claims, but said they are without merit.

At retail locations, Starbucks states that its lattes contain 12 fluid ounces for its tall size, 16 ounces for grande, and 20 ounces for venti.

However, “Starbucks cheats purchasers by providing less fluid ounces in their lattes than represented,” according to the lawsuit. “In fact, Starbucks lattes are approximately 25 percent underfilled.”