I kinda thought they continually learned and basically adjusted the engine based on its performace during the last time period. Killing the battery would erase that "buffer" and therefore the engine would have nothing to work with. Not that they learned once at 3,000 and never changed.

Learning once would seem a bad idea because who believes an engine at 90,000 miles peforms the same as it did with 3,000.

So driving on one that learned on test drives would be okay... after you drove it long enough to push that out of the "buffer".

Of course I'm not a mechanic either.