Purchase the lowest octane gasoline you can use without your engine pinging or knocking. Once you know your vehicle's octane level, use higher octane only under stressful driving conditions such as pulling heavy trailers or boats. Using too low an octane can cause engine damage. Using too high an octane for the driving conditions of your vehicle will not give you more power or better mileage. Find the brand of gasoline that works best for your vehicle.
Some consumers report they notice different vehicle performance with different brands.
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