So your Impreza has the 4-speed automatic. That's why you're not satisfied with the mileage. 20MPG in city traffic is easily achievable with my dad's '10 Impreza hatchback with the dual-range 5-speed manual and the 2.0L engine, even with the E25 gasoline used in Brazil. It's not so unusual to break the 30MPG barrier with it in highway even with the air conditioneer on.
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