Here's a list of things that have a big impact on your city MPG, ranked from biggest to smallest.
driving style - very big in the city!
the weather
LRR tires
aerodynamics
weight reduction
I would set up a "trip MPG" X-Gauge on the ScanGauge to coach driving style, and look around the forum for driving tips.
Also ask yourself whether you really need rear seats, or rear floor mats. You could start deleting optional equipment, converting to manual steering, and removing the car's interior, but the wife probably won't appreciate that.
I've heard the Aveo delivers pretty disappointing MPG, and I guess you outlined why. Good luck with it, and if you drive well, I'm sure you'll be able to beat EPA during the summer.
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