Average water consumption

[Macabre]

Hey Nenad.. this is for your Passat I presume?

I use about a half gallon of WI-fluid per tank of gas, of course depending on how I drive. It's a difficult question to answer precisely since it depends greatly on the design of your WI system, but a gallon sized resevior is common for street cars.

Or look at it this way... if you're running 6 440cc/min injectors @ 3bar @ 80% IDC at your horsepower peak, with 20% water/fuel ratio, you'll be pumping about 420cc/min of water, so you'd empty a 1 gallon resevior in about 9 minutes of max usage, so just figure out how much time you would spend at peak power during the course of a tank of gas. You'd empty your fuel tank in about 30 minutes giving that example.