Thanks for the replies gents.

I haven't shot a mule deer buck in many years, but when my kids started hunting, they shot several young (2.5-3.5 year-old) mule deer bucks, usually in October, and I thought they ate just fine. Same with the mule deer does they shot. They ate fine also.

It very common here to see mule deer and whitetail feeding in the same field and inhabiting the very same area so it stands to reason they are eating pretty much the same stuff.

Funny thing is though, many older people around here, who enjoy wild game won't touch a mule deer... They say its terrible eating. The same people will claim to love whitetail. I grew up hearing how mule deer was best suited for feeding stock dogs. I haven't experienced bad mule deer, but eat 15 whitetails to every mule deer also so maybe I just haven't hit a bad one yet?