On a serious note, Make sure all tires are at optimal PSI which is about 35 PSI. This saves some gas. Also take out anything you have laying in your car i.e. college books and other nonsense. Reducing the weight of you overall car will also improve you gas mileage. You can also get lighter wheels like some gram lights. a CF hood and trunk. Also make sure you air filter is clean. That helps alot.
My second suggestion would be to trade in your wrx for a prius if your concerned about gas mileage.
Otherwise , you got to pay to play.
And uh, when you coming out to NYC so we can hang out.?