Does A 2025 Lexus Rx350 Require Premium Gas Tank Size. For the naturally aspirated engines that the rx350h and rx450h+ have lexus recommends 91 with a minimum of 87 required. What’s the gas tank size of a lexus rx350?

Please see the chart below for the recommended minimum octane rating for your vehicle. Detailed specs and features for the 2025 lexus rx 350 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more.