2010 Toyota Prius I 4dr Hatchback (1.8L 4cyl gas/electric hybrid CVT)
We bought it to get great gas mileage and that's what it does. After driving on 1 tank, we averaged 45 mpg...yeah, it's not the 48/51 as stated on the EPA but I can definitely live with 45 mpg when gas is creeping to $4/gal. Also, don't let people tell you otherwise, there is plenty of space in this car. No it's not a minivan or an SUV but it's spacious enough for a family of 4. I plan to write a review a year from now on it but initial first impressions are definitely very positive!
The trip button on the steering wheel. Screen on the dash that shows how fuel efficient you are driving. Eco Mode and Power Mode.
None at this time, I'm sure as I drive it long enough i will think of something. Otherwise at this point it seems to do exactly what Toyota designed it for.