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The INFINITI G37 requires 91 octane premium unleaded fuel or higher for optimal efficiency. Maintaining your gas tank in good condition is crucial to getting the most miles per gallon. Issues may arise, such as a loose gas tank, malfunctioning control valve, or a stuck gas cap, which can be troublesome. It's important to address any gas leaks promptly. Over time, car parts may deteriorate, so it's recommended to replace the fuel filter every 30,000 miles to prevent performance problems.
I have driven 141,000 miles on my 2008 G37S, always sticking to using mid-grade gasoline, and I have never encountered any issues or needed to replace any parts.
The Infiniti G37 requires premium unleaded gasoline with an octane rating of 91 or above.