any form of em you get is basicly just a base map, every car is different so once you load a base map be it from the AP, open source or whatever, to get optimum proformance from the base map it needs to be tuned buy a Tuner.
the term protuned that people throw around is only when you tune your ap, with their PROTUNER software. otherwise it just a tune.
your mpg will suck reallly bad until you get it tuned before my tune i was getting aroun 200-220 to a tank, after the tune i get like 280-300 out of a tank
Dom Tuned 2003 WRX Wagon
If it's worth doing, it's worth overdoing