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Some actual mathematics would be good too, rather than ancient patent numbers.

Just because something has a patent, doesn't mean it has any value.

So then a 10% mix is hardly going to keep the weight down, is it?

Maybe if you were moving water in a shipping container, that marginal weight saving may make a difference, but assuming that the total fluid mass will be in the region of a few kilograms (at VERY most, otherwise you have a whole new set of problems), the weight saved by using alcohol is not even worth noting.

Absolutely not a selling point.