No need to add oil to your gas. Modern day injection systems are very reliable. Disabling your oil injection system and adding oil to fuel is an option, but a poor one. Your injection pump can decrease or increase oil delivery based on RPM's, allowing the motor to operate efficiently.
When was the last time you replaced all the fuel hoses from tank to engine? Todays fuels require updated hoses.
If the motor is fuel injected, when was the last time you had the injectors cleaned and flow tested?
Adding the proper amount of additives such as Yamaha Ring Free or Mercury QwikClean to each tank of fuel will keep the combustion chamber and other components free from carbon build-up.
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