I have the same situation, although my buddy is smart enough to realize that qualitatively speaking, i throw down just as much, if not more than does he.

IMO: do not explain it to him. if he has not realized this himself, then he is likely too fool to comprehend, and confrontation about the issue would only cause fighting, him possibly thinking you are a pot schnob or worse, end the friendship.

just go buy ya some mids, bro! you'll be pleasantly surprised by the price, and you can smoke blunts with your friend. save the good shit for at home

peace