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Of course they are, an extra £2 every 300/400 miles for the sake of det and pinking and melting a piston.
I've seen many cars having 95 put in and running badly with engine management lights on then with a tank of super put through its fine again.
It happens almost everyday on here, same symptoms, same post, same comments, its and injector.
People need to learn to search. Only need to search misfire!
I learnt a trick from an Evo owner about wind noise.
Undo your window and out your knee into the door card and pull the top of the door towards you just bending it slightly to close the gap up top!