I think that it is a fair question, although I also believe that it is fair information to simply OFFER when being paired up with someone that you don`t know. I know that, on the past few dive, I have gone through a lot of air quite quickly - for whatever reason. I also know that I have begun examining my equipment, my physical condition, etc. to determine what exactly is causing me to use that much air (since I didn`t have that problem on the same size tank [63 aluminum] when I was certified).
I think i tis important to know your buddy and their abilities and limitations before entering the water. The only way for someone to know you is to offer up information that is helpful. Since my air sucking was first noticed by me, I have always told people that have been paired up with my husband and I.