Esso 埃索 F1 Vs 8000

Any one of you know the difference between F1 and 8000 of Esso (埃索) gasoline? Currently F1 is sold at HKD17.42/L while 8000 is sold at HKD16.46/L. Would like to know more when I pay more for F1, what are the real benefits (e.g. better power, better performance ...etc.). Thank you!