Forgot to add that using the oil pump sytem is the best way for your road bike.
Mixing the fuel in the tank is mainly just for racing bikes these days.
The oil pump system is much more practical and less fuss than messing about mixing oil at the petrol station. Also it's safer for the engine too if you have little knowledge of the mechanical operation of the engine.
There is no need to add extra oil to the petrol in the tank when there is an oil pump system fitted to the engine.