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What type of gasoline does a 2005 Chevy Trailblazer use?

The 2005 Chevy Trailblazer recommends using regular unleaded gasoline (87 octane). However, using mid-grade (89 octane) won't hurt it and might provide slightly better performance, but isn't necessary. Avoid premium (91+ octane) as it's unnecessary and a waste of money. Always check your owner's manual for the most definitive answer.