However, water/methanol was/is used on the F27. When doing it's job, the engine made a slightly different noise, but you couldn't really feel the difference. It gave a few hundred kilos more on your RTOW from a short runway. However, it is expensive and most of the time just ballast because you don't use it on every departure. It was also a pain for the refuellers to stock and replenish. However, the chaps at SOU were more than helpful.