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There are two main things that should imho be taken into account in order to get the best results from water injection, and that is cr and lean burn!!
First, with a higher cr you get higher temperatures on the compression stroke which water takes care of and can allow you to drop octane down instead of buying the higher octane.(just make sure to always have the system full!!)
Second, lean burn can be better utilized due to the water again soaking a good amount of the heat from the burning of fuel allowing you to be able to lean out more then 25% in some cases.(from what I understand a ice is running 25% rich in order to keep temps down?!?)
And for a third one, waters rate of expansion is far higher than air is so having some water injected into your engine either way can improve its performance whither its power or fe specifically it's still a benefit in the end(however there's a possibility to get greater benefits when the other two are added to the equation!!)
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