I do not own a float tube but I know a lot of fly fishermen that do and they are constantly adjusting the air pressure in the tubes due to heat and cold. Since the latest rage is replacing the air in your vehicle tires with nitrogen which is suppose to be less affected by temperture changes, I was wondering if anyone has tried replacing the air in their float tubes with nitrogen and if there would even be any advantages to doing this. Just a thought and nothing more.....