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I use 100mls making 3 fill ups off a bottle usually 45 litres (fill up when the tank gets to 1/4 to avoid fuel surge) The NF makes a noticeeable improvement in both smoothness and performance.
Reccomended measure on the bottle is 60 mil per 60 litre tank. I use around 100- 120 mil per tank on the road, and more when on track(decatted Tek3 P1). edited to say this is NF Race ( the black bottle, that I'm talking about).