I disagree. I have been told several times otherwise over the years by well placed trusted sources . I was told the various car manufacturers do in fact aggressively negotiate with the tire supplier's (or any other component supplier) to get the best price before they sign a contract. The tire suppliers simply respond by cutting costs to get the contract anyway they can, including softer rubber or every so slightly reduced tread depth. Generally this only reduces tire life, the OEM tire version performs the same as the full retail version, good, bad or mediocre...