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05/06/2023 1:00 pm
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Is premium fuel absolutely required for a 2020 Lexus GX460 with the 1UR-FE 4.6L V8 engine? I bought this used with 26,000 miles. This exact engine is in many Toyota Tundra trucks but Toyota only requires regular gas for these vehicles. The compression ratio for this engine is 10.2:1. If I put regular (87 octane) gas in the Lexus, could it produce knocking and potentially hurt the engine?
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05/06/2023 1:24 pm
It's possible that in the Tundra the engine is tuned differently, has different ECM programming, and may even have a lower compression ratio.
Check your owner's manual. If it says premium fuel is "required", use it. If says "recommended for best performance" you can try dropping down a grade or two.
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