I brought my STI to High Plains Raceway today for a track session since my 911 has a tire issue (long and complicated story).
The bad first:
I averaged 3 mpg. I shredded a set of tires. The brakes were cooking after the first session, but were better after I knew the track better and braked more efficiently. I got fuel cut for some reason at the end of the day after many laps without it. Maybe it was air pockets in the fuel lines.
The car is amazingly forgiving. You can really do a lot with it before it bites you back. The stability control can be left on and it doesn't interfere that much and let's you go WAY out there before it starts to do something. The suspension is phenomenal even on the track in stock setup. The stock tires and brakes were also impressive. Power at stage 1 was as much as I could put to the pavement other than in the straightaways. If you have a 2011 STI and think your suspension needs any changes you need to realize your driving needs changes, not your suspension. Amazing factory setup.
Breakdown of the car on a racetrack:
The STI is phenomenal. I was keeping up with and passing purpose-built earlier Porsche race cars on slicks and stripped bodies. I was equal with late model 911 cars. I had an instructor in the car for the first couple of sessions and he was amazed how well the car was planted and how much it could really do.
$140 in fuel (god it guzzled gas!). One set of tires gone ($600+). Brakes probably need replacement ($100 done myself for new pads). So roughly a $800-900 day. Tracking ain't cheap folks if you want to do it.