Needless to say, we won't be buying an Aveo. We won't be buying anything, for that matter. However, if you're in the market, you might be interested in this list of cars with the best and worst gas mileage estimates. How cool is the Toyota Prius hybrid? It gets better mileage in town (60 mpg) than on the higway (51)! Annual fuel cost: $524. Compare that to the least efficient midsize, the Bentley Arnage, at an annual fuel cost of $2636. A more average midsize sedan costs about twice as much as the Prius to operate at around $1000/year for fuel.
Speaking of hybrids, welcome entry to the short list of more economical vehicles is the new Ford Escape Hybrid which is supposed to get around 35 mpg around town. That's not so much to brag about, but it's at least 10 mpg more than its gas-guzzling siblings, so at least it's a start.