AWD is really going to hurt you mileage. I would suggest a nice tune up, tire pressure adjustment (get it as high as you can SAFELY do), ride with the A/C off, dump the extra weight... most importantly look over the hypermile tips and increase the effectiveness of your driving style.
Stay on the highway and out of the stop-and-go traffic as much as you can. Honestly, I don't think impreza's get that great of gas mileage from the factory.
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