My first Mazda six (diesel) engine was much sweeter in its third year with over 100,000 miles on the clock than it was in its first year, but this is probably due just as much to my right foot learning instinctively how to drive it, and the engine components being properly bedded in, as it was to any ECU 'learning by doing'. On the one hand unless Mazda are total idiots, then the very first time the ECU experiences a knock, it knows what exactly what to do about it. But I also know that sensors that convert analogue signals back and forwards to digital information need to be 'run in' and that this may cause a burn in period in the same way that my expensive CD player sounded better after it had been used for 100 hours than out of the box.FWIW this is what I care about and agree with. And this what I also experienced with the NA 2.5. It took several thousand miles of driving for both the car and me to break in. While the engine management needed to learn how I drove, I needed to learn how the engine made power. At over 30K of experience between me and the ECU this NA engine has grown into a gem of an engine. Whats funny is that it probably always was a gem. I just needed to adjust my programming a bit as well. IMO
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Hopefully in three years time I'll be able to tell you how I experience a Turbo 6, assuming they ever come to Denmark.