Yes, the Lexus LX 570 requires premium gas. The reason for this is because the LX570 has a large 5.7L V8 engine. This engine is designed to run on higher octane fuel in order to perform at its best. While you can technically use regular gas in the LX 570, it's not recommended as it can negatively affect the performance of the vehicle. So if you want your LX 570 to run smoothly and efficiently, be sure to fill it up with premium gas.