After 1.5 years I am still in love with my Civic Hybrid. I get about 45 mpg and fill the gas tank about every 450 miles. Passengers are always surprised that it seems like a normal car - until it auto-stops at stop lights. They they are REALLY surprised! It has a quiet high- pitched whine that is annoying for people who can hear it but it is easily covered by the stereo.
The hybrid engine, of course! Auto- temp and -fan are good too.
Second power outlet button to auto- stop even when car thinks it shouldn't such as in stop-and-go traffic and when parked.