This is an interesting thread, i've had similar feelings on and off over the last couple of months, although mine is leased so i've got it for 2 years regardless.
Your economy seems quite low, I average 30mpg and that's driving hard - on a run I often see 37ish.
For me the main issue that lets the car down is traction in anything other than perfect conditions.
I think there are 2 reasons for this, firstly the Bridgestone tyres aren't all that. I'm seriously considering ditching them for some Pilot Sports at some point. I might also try lowering the PSI that simonali mentioned - have you got a link to the Evo article?
The second reason is most of the traction the reviewers rave about seems to come from the diff doing it's thing. As I mentioned in one of my own threads I haven't quite found the diff to be 100% dependable - sometimes there is a small delay before it kicks in. You almost have to think against your natural instincts to get the most out of the car. When you are accelerating our of a corner and the under steer kicks in it's natural to back off a little, instead, it seems you have to keep it nailed to get it to kick in and transfer the power.
Obviously if you are going to try this find a corner with a couple of lanes to slide into if it all goes wrong