tbh with a full tank its going to be diluted and maybe not as affective.. yes i realize it needs a certain amount but id use less rather than more..
i also try and use a carb cleaner take of all the inlet hose for the throttle body and give it a major spray with the butterflys open and closed.. this moves all the sh!t and if done regulary it really does make a diference.. if u cant see all the metal and its tarnished and black do it again!