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That's assuming buyers are smart enough to refill the water tanks. GM ditched water injection because they weren't.
Unlike urea, where you can have a big enough tank to last till the next oil change, you'll need to refill a water tank often... Unless you have a big reservoir, several times per fuel tank. And it needs to be distilled to keep from clogging nozzles... which will add to cost.
(I love water injection, mind you...)
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