I travel about 50 miles roundtrip each day (except weekends), car has about 13k miles on it right now and it will be one year old in September. I love the MS3 as a daily driver, get to know where you can have a bit of fun on the highway without getting tickets, ha ha. Or if you just want to get the best mileage, drive easy but upgrade your stereo system and enjoy the tunes.
I had a Geo Metro for many years. Got at least 40 mpg, but holy crap, that car was a bear to drive. The only redeeming quality was upgrading the stereo so I could drown out the road noise, the engine noise, and the lack of air conditioning...