Allegedly - normally the engine will start to stumble if more than 20% by volume water is added as fuel. If that is correct and you add water at 20% by volume as fuel right through the driving range then you'd need your water tank to be no bigger than 20% of your fuel tank. I know Ricardo was supposed to get as much as 50%.... but you will have other problems if you start trying to maintain that kind of ratio - lubrication being one of them.
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