Ouch! For your sake I hope Dan was just throwing numbers out...
He had 3.5% for new, 1.5% for broken in and running strong, 7% junk...
5.5% at 3-400 miles by the numbers given, doesn't bode well. Maybe Dan can clarify.
I guess this is hard to pick a number that works for everyone.
My personal feeling is don't expect great performance without great low leak down numbers.
0 to 2.5 great
2.6 to 5.0 fair
5.1 to 7.5 not good
7.6 and above bad