My friend has a decibel meter. Checked my Fit last night to see how loud it was.
With windows rolled up, at Volume 23 (it goes to 35 max, but still sounds good around 27-28 without distorting), the decibel meter was reading 129 Db.
Here is a little chart to give an idea how loud that is:
Decibel (Loudness) Comparison Chart