Does this prove David Vizard's 128 lsa formula ?

Ok George, this is YOUR baby so I'll ask you. How did THEY come up with 20%? Pull it out of their ***? Did they do a coast down test? Consult the magic 8 ball? Did they conjure the Witch of Endor?

Like I said, 20% sounds at least a bit low.

This is what happens when you worship numbers without asking a simple question.
It's the same premise as believing one man's formula is the end all be all for every single danged combination out there. Ain't happenin, I don't care how smart the guy is. I would "JUST BET" I can get closer using a good "educated guess", a degree wheel and a compression gauge.