Staff Answer
Aug 15, 2026 - 01:25 PM
Engine combustion efficiency and knock prevention on the 2023 Hyundai Elantra are regulated by knock sensors, variable valve timing, engine control unit (ECU) ignition timing adjustments, and fuel injection pressure regulators.
How to Fix It:
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Use Regular Unleaded Fuel: Fill the vehicle with standard unleaded gasoline with an octane rating of 87 AKI / 91 RON or higher for optimal performance and fuel economy.
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Avoid Higher-Cost Premium Fuels: Understand that using premium gasoline (91+ octane) in standard Elantra models provides no added benefit or horsepower increase due to factory compression ratios.
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Refrain from E85 Flex-Fuel: Never use E85 high-ethanol fuel blends unless driving a designated Flex-Fuel vehicle, as it can damage fuel system components and void engine warranties.
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