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Before I did anything else major on my metro I tried water injection. With it mixing water at a 10-1 ratio it actually improved mileage by 4-5%. The trouble with the simple systems is that they are nearly impossible to keep dialed in. I ran -40f rated windshield washer fluid in mine.
I quit using it after a few tanks. I got tired of it going out of adjustment every time the weather changed 5 degrees and using a gallon of water in 50 miles or quit injecting enough water and making the engine knock like crazy because the ignition was at 15 degrees advanced and was not able to run like that without the water.
I always planned on going back to water injection but this time using a fuel pump and injector to actually meter the water properly with the engine. The plan was size the pump and injector so it only puts out 10% the flow of the normal fuel injector. Something like that would work and with a 2-3 gallon water tank it would be pretty reliable. Maybe after I get done with all the craziness I am working on now I will try it out but that will probably be a while.
The other option is to suspend the water directly in the gasoline using naptha or some other stuff so the car needs no actual changes to run the water in the proper ratio. There are a few patents on this idea and the few tests I have found all showed a good increase in mileage. But coming up with the right solution and having the ability to mix the water/gas at the gas station when you fill up the car might be a real nuisance.
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