@vxx46 👍Likewise! Always good to collaborate.  Heres a chart of $SPX 
with $VIX in orange and the realized vol (HV21) in cyan. 

Forward looking (implied) vol overstates realized vol by about 10 points.      

(21 trading days approximates 30 calendar days of VIX ) https://t.co/jX3nB9WFtN