dont expect a noticeable power increase because the power to charge the alternator sorta takes away the power gain....although your top speed should be higher...before i could barely go above 160 km/h...now i can hit 180 km/h (which is as high as the speedo goes)...mileage gains all dpends on what u use for electorlite, electrodes, and for the pcv jar, it depends on the oil used....for the pcv jar i have found the best results using cheap oil (becaue there are no additives to prevent it from cracking to fuel) and about a litre of tranny fluid to keep things well lubricated...that has given me the best results...the hydroboost sstem still has room for experimentation..if u can find something for electrodes that doesnt get eaten away or rust when under electrolosis, then u have found the key..although dont count on it...just be happy with stainless steel or whatever (try a few different types if u want so u can see if there is any difference) for the electrolite...that is the big part...if the water from the tap is filled with many minerals and crap then dont expect it to work very well...i still have yet to try distilled water, but that should work very good....and use acid...baking soda and epsom salt and whatever else they say u can use really sucks...it works, but the bubbles are half the size.