It's possible that the horsepower discrepancy you're seeing on AutoTrader is due to different markets or regions. In the US, the Model 3 Standard Range Plus has a horsepower rating of 244, while in Europe it is rated at 225kW (equivalent to approximately 302hp). It's also possible that the higher horsepower rating you're seeing is a result of modifications or upgrades made by the previous owner of the car. It's always a good idea to check the specific details of each listing and reach out to the seller for clarification.