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BMW is reportedly working against the reprogram-tuning approach, as are many manufacturers, by locking down more and more parts of the control units. With gasoline engines a dying breed (sob) it seems a strange choice, personally. These add-on boxes may be the only choice for some.
Regarding fuel, in my area (Boston/New England), 93 AKI is readily available at Exxon/Mobil stations, and runs well in my cars. Sunoco has some higher-rated formulas, but I've had mixed results with it. It seems to attain this with additives, inconsistently. I just stick with Mobil.
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