Staying out of the boost as much as possible is likely your best starting point. But doing that for very long can make one wonder why they have a sports car at all.
I had both an Isuzu Impulse RS AWD Turbo (~400 HP and 2500lbs), and a more or less stock STi. If I got low 20's out of either car, it was an exceptional tank of gas. More often 15-16 mpg was the norm for both of them. Absolute power corrupts absolutely!
Now when I drive, it's our new mini-minivan, which just doesn't produce the same accerlation grins, so I don't even bother - but I still don't slow down for the corners much. It's quite impressive in the handling department.
Anyway, welcome and good luck.