See also:

Gasoline for California-certified LEV
If your vehicle was certified to California’s low emission vehicle (LEV) standards as indicated on the underhood tune-up label, it is designed to optimize engine and emission performance with gasoline ...

Engine
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Manual tuning
Turn the “TUNE/TRACK/CH” dial clockwise to increase the tuning frequency and turn the “TUNE/TRACK/CH” dial counterclockwise to decrease it. Each time the dial is turned, the frequency interval ca ...