I read on page 100 (from 2006 postings) or what so ever that if I put 100 octane in my srt-6 the car will not take full advantage of the 100 octane, is this true? If so what will I need to mod to take full advantage of it and what are the estimated costs? The reasoning being for asking is that I was reading about people using e85 and not discussing about not getting the full potential of the 105 octane.

Thanks,
Nick