I've owned a 6 speed CR-Z for the past 11 months, I still look forward to getting behind the wheel.
Lets be honest if you consider the 6 speed then mileage is not the only thing on your mind. It's all about the drive, the windier the road the better, any time at the wheel listening to a great sound system is a joy, long trips become more enjoyable.
What this car delivers on is very solid crisp road handling, head turning good looks, maneuverability in tight spaces, Honda quality, great fit and finish, very conservative fuel consumption, and it's just plain fun to drive.
Handling, interior room, build quality and MPG.
Power, A turbo would put it over the top and would not compromise on the economy, but give the little extra kit in the pants.