Most of what firewalled said.
In his calculation, with Vref = 1.3Vs, that takes the final approach speed from 59 to 56 knots. Enough I'd like to get it right and not have that extra energy to get rid of during the last part of the landing, especially in a taildragger.
Best glide follows different rules and unless you have good reason to, just use a single figure.
G