It wont be my problem in 35 days My AFR gauge reads rich all the time under acceleration, and just goes into Optimum range at WOT. Only goes lean when I'm gear breaking off the throttle, or idling at the lights, which I consider normal. Over the last year, I've only had 7 counts of knock retard (and that was on a bad batch of fuel from Caltex after they had the total shutdown over Xmas and I had to get 91Ron mixed with 98Ron in Agnes Waters - fuel is $hit there), but in Brisbane, no fuel cut or stuttering, so I dont think theres a problem with my car. My 2.3ltr MZR motor has been top notch and has certainly behaved itself... For the record, the mileage i noted above was mostly highway driving. Squirting around town (stop start stop start at the lights), i'm lucky if I get 450km to a tank.
And interms of guzzling, if I really cared that much, I wouldnt be buying a Subie Sti