On the GEN IV E38 I've seen some people talking about having up to a 10* difference between the high and low octane spark tables (B5101 & B5102). I've also seen where people have these tables exactly the same.
What is the preference on the GEN IV systems? I understand there is supposed to be a blending of the two, but if they are the same, how does that happen?
Respectfully,
John~