I love the THX too and as stated previously, if I took the bass down to minus 2 or 3 and turned the mid range up a few notches it sounds much better. Of course different music requires different settings. I guess I am an audiophile LOL
I have only had mine a shiort while but it is a hybrid and I am getting 46.2 MPG depending on what kind of driving I do. I was reather surprised because I figured it would be less but I talked to another guy who says he gets about that too.