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People have also claimed FE improvements using acetone and HHO systems despite evidence to the contrary. I will admit that water injection can show FE improvements but it only really comes into play at full load. Also FE gains resulting from water injection are usually less than 5% .
Water injection is different than high humidity. As the mist evaporates it cools the air which results in more mass trapped in the cylinder on the intake stroke. Assuming the use of EGR those two factors mean less heat loss to the engine block during the power stroke. The end result is more power in the output. High humidity alone just thins the air.
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