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I don't think water injection is going to have much effect on mileage unless your foot is in it all the time. The main reason is water injection doesn't work well at low loads. Its best use is an internal coolant and knock suppressor. It can also be utilized like a charge cooler to some degree to allow packing more fuel and air into the cylinder. In extremely high engine loads with very high temperatures it can cause the water molecule to disassociate act like a a catalyst to aid combustion.
The common conception that it will boil and expand and give a boost like a steam engine does not take into account that the energy to overcome the heat of vaporization is being taken from the combustion gasses and reducing their expansion. There is some gain from this but its not as much as you would think. Also to have an effect the water would have to enter the cylinder as a liquid and not a vapor.
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