math re hitting 3- or 4-card 15s and 16s in 6 and 8 deck games

The only things I remember seeing on this subject were in "Revere's" Playing Blackjack as a Business, which was about the single deck game, and in Braun's How To Play Winning Blackjack, about the 4-deck game, which only included the statement (paraphrasing here), "you would hit only very few 3-card 16s."

Can anyone point me to any studies regarding hitting 3+card 15s and 16s in today's 6- and 8-deck games?

Thanks