I have a 59 2.0tfsi. Since i got it i have been using normal unleaded fuel
recently my friend told me i should try super/premium unleaded because it will gain abit of power (every little helps):P
So when is it the best time for me to do it ??? currently I have full tank of unleaded wonder if I mix it during half of tank ???
*My nearest fuel station is Tesco which they offer premium unleaded and i normally refuel once a week*