I've already got water in my fuel, thanks to E10. My cars have all gotten much worse fuel economy since the mandatory E10 law was put in place.
I say the person suggesting the experiment try it first, and report back to us. The only time I've had a wet air filter, the car choked and died due to the air restriction. I had to take it out to drive home, and then let it dry out.
If water was a good idea, then probably the best way to introduce it would be post-filter via an ultrasonic humidifier.
Better yet, why not just drive around in fog and report back the results? Fog is 100% humidity. Heck, just driving around anywhere in Florida should tell us if humidity helps anything.
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