Alright... I know a little bit about the different types of injection (water, propane, alcohol/water) but I've never found a platform where all three are being used. Therefore it's really hard to find out what the benefits of one system is over the other. On WRX's, water is used primarily with a few propane peeps walking around. I just want to know what advantages one system has over the others... I know how they work, and the differences between them scientifically, so you don't have to go into that. Just wondering the real world differences.