Ok I know I shouldnt be running 89 octane fuel through my tank.. but I have for the past 6 or 7 months without any problems.. now I have decided to switch to 91 because it is recommended.. however after I ran some 91 thru my car it seemed a lot slower.. in fact a whole second was added to my 0-60 time.. is this possible due to the change?

 

Why do you have to start a new thread??