I consider it two different things- gelling is a condition of the fuel, where icing from water is caused by a contaminated fuel system. Icing from water can/will occur anytime the temp is under 32F, where gelling usually isn't an issue until apx. -15F. I've never looked into it, but have some research to do now- I don't know if 911 will have any effect on water/ice.
Last edited: