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What grade of fuel do you use in a Jeep Grand Cherokee?

The recommended fuel grade for a Jeep Grand Cherokee depends on the year and engine. Consult your owner's manual for the specific recommendation for your vehicle. Generally, many Grand Cherokees use regular unleaded (87 octane), but some models, particularly those with larger engines, may require or benefit from mid-grade (89 octane) or even premium (91 octane or higher) fuel. Using a higher octane than recommended won't hurt, but using a lower octane than recommended could negatively impact performance and fuel economy.