im not really sure on using it to get better milage. you would proble need the snow max milage kit, i dont think the snow stage 2 will get you what you want, mine is older but the stage 2 just works off of boost its not a progresive controller.
some how you will have to have it just give it a little watermeth when your driving but not to much or you will flood it out, i just dont see how the stage 2 will do that???
i have mine come on at about 15psi but that is max injection, try playing around with the controler to see what the lowest boost you can turn it on and not snuff it out