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What octane gas should you put in your 1994 Ford explorer?

The 1994 Ford Explorer's recommended octane rating is regular unleaded (87 octane). However, using mid-grade (89 octane) won't hurt and might offer slightly improved performance in some situations, but it's not necessary. Avoid premium (91+ octane) as your engine isn't designed to benefit from it. Always check your owner's manual for the most definitive answer.