This has been a popular "gimmick" since the 60's. You can inject water into the combustion chamber and not do dammage if the amount is small, BUT it has never been PROVEN to boost mileage. Besides, up here in Minnesota, where it is presently -16 F, any water would be frozen and the "pickle jar" storage container would shatter.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming
