Just got a base Mazda3 i this past Saturday. I did do a search on this forum & here. Only found that one guy in Aussie. So is it just not possible to make this work in the base car? Would it be (could it?) just as simple as buying the factory top-o-the-line radio with the info button & other hardware is already in the car (Although I would imagine, that even the base model car computer "knows" what the milage is in software, I just did not buy the hardware to display it).