At Roanoke one year (long, long ago) I had an RPI of .84 something after 7 games. Obviously it came tumbling down, but it was pretty cool (Pretty sure I lost the game after RPI came out). We had an annual challenge with another couple conferences and I was playing an absolute gauntlet of a schedule, mostly on the road. I remember checking the all-time RPI board and thinking I was a lock for the top spot lol.
Edit: Pretty sure I did the calculation and the difference between my SOS and the #2 SOS was like the difference between #2 and #60 or something like that.