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You're doing pretty well! Do you have a manual or an automatic transmission? Under the same conditions, a manual will typically result in an instant 10-15% gain. I had a 26 mpg lifetime average with a stock 96 Legacy L wagon automatic (including winter) and typically got 27-29 mpg in the summer - until upgrading to an 05 Legacy 2.5i manual a few weeks ago. I now get up to 32-34 mpg in mixed driving.
With either transmission, you save fuel by downshifting when going downhill or approaching a stop, since when the engine is in gear with the gas pedal released it will use no fuel at all. I've noticed no difference in fuel consumption with the windows down, even at highway speeds - but there's an instant drop on the mpg display as soon as I use the AC.
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