Originally Posted by Nik@SOHO

Water meth = Unicorn Tears

In all seriousness, the benefit of adding a water methanol injection systems aids in providing cooler intake charge temperature, increases octane, provides an additional 200 cc of fuel flow (depending on nozzle sizing), and is a great knock suppressant. In regards to how it aids in tuning, if it used with any fuel it will increase the octane rating even with E85 as the tendency for knock to occur is minimized. Consistency in power is another reason, with most fuels, especially on hot days you will notice a drop in power, the water is able to evaporate under the high temperatures in the cylinder and as it evaporates it is able to take the heat away with it. Where we are located a lot of gas stations do no have E85 so going with the 93 and water/meth is a great substitute as we have seen very similar numbers if not more power than E85. Hopefully this is able to answer your initial question.