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I've noticed it has been using water for a little over a year, but since I don't drive it much I have just been letting it go. Driving home yesterday on the interstate it got hot. Let it cool off toped it off and then stopped at the store to get more distilled water. And it was then it started to blow white smoke out.
I pressurized the cooling system and in 6 hours it dropped 3psi
What was your starting pressure? If that white is coolant you can distinctly smell it. Burn off after a pass down the road? Loosing volume in the system? Should be worse on cold start, a failing washer on an injector will cause the lower ring to toast and do the same until it breaks and hydro locks. Just some thoughts. Hydrocarbon test the coolant, if it is coolant it's will be distinct!