Uh, guys, we're talking PREMIUM!!!!!!

Anyway, I get about 10/100 (that's 10 litres per 100kms - that's how we do it up here in the great white north!). That means the occasional flooring, but mostly conservative driving, and 100% in the city. That equates to about 30mpg I think? Maybe a little less?
One time I set my boost controller to max (about 13psi), I got about 170kms on one tank.

Setting the boost control seems to make the car run rich or something, even if you're not boosting. I even use my A/F gauge to try and save gas...