so I did a small experiment on my GTi... I filled up at my course with our regular 89 to see if I could feel a difference (and in no way am I a race car driver) the only time I felt a change in power was right after take off when the turbo is just starting to build pressure, but it wasnt dramatic I had to do it a couple of times to make sure. I also felt no difference on the freeway I could still pass cars with ease while in 6th..
my conclusion being for me at least is that 89 is ok in a pinch but there is always the thought in my mind of detination from the pressure being to high so, there for my Fast will always drink the good stuff.
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