Water is technicly a unlimited octane. I am running it though the windsheild washer fluid tank, and I put a bit of alchol in with it. Mainly to make sure everything is cleared out.
The tank lasts a while. You don't spray much in there, just enough to get a mist, and only while you are in full throttle. I have a LED that lights up when the tank gets low, and I just have to fill it back up.
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