Should the Classic Focus use 92 or 95 octane gasoline?

[McArthur]

Classic Focus uses 92 octane gasoline. 92-octane gasoline contains 92% isooctane and 8% n-heptane. The higher the compression ratio of the engine, the smaller the volume of the combustible mixture being compressed, resulting in more power and lower fuel consumption. The Classic Focus is a 5-door, 5-seat compact hatchback under Changan Ford. The vehicle measures 4342 mm in length, 1840 mm in width, and 1500 mm in height, with a wheelbase of 2640 mm. In terms of power, the Classic Focus is equipped with a naturally aspirated engine, delivering a maximum horsepower of 124 hp, a maximum torque of 161 Nm, and a maximum power output of 91 kW.