safetypee
Without having de-iced in the US, it seems like Type IV fluid is more common there than Type II. I don't have any experience with Type IV, but from reading up on it, it does provide a longer HOT. In Norway, where I do 99% + of my flying, the only types used are I and II, and I've never had any issue with HOT. Is the reason it's used longer taxi times from the de-ice pad to the runway compared to other places?