Pros Mileage, quite
Cons None - no complains
Summary Have owned one for over two years. Average lifetime mileage is over 50.
Cooler weather will reduce mileage, typical mileage for me has been around 45 in the winter. Warm months better mileage, typically around 52-54 and have seen 57-58 on a few really good days.
Typically over 500 miles to a tank, fun to just keep passing the gas stations, particularly with prices as high as they have been.
Pros Decent gas mileage. Plenty of space. Decent ride.
Cons While the gas mileage is decent, you won't be able to get the advertised 45mpg. I averaged out around 33mpg and that's with me really trying to control it. I have a friend with a regular 05 Civic that gets nearly 40mpg as compared to my hybrid's 33mpg.
Summary I wish I could say you should buy this car, but it's not worth it. The 03-05 HCH's aren't worth the money that you'll have to put into them in the long run. Advertised mpg is 95% unachievable and the transmissions are guaranteed to have issues.
To sum it up, look into buying an 06 or newer HCH, a standard Civic or a different car all together. These are not worth the trouble and Honda isn't much help.
Pros The interior is fairly comfortable, it shifts crisply, and gets out of its own way when pressed. MPG is good at 35-43 mpg depending on how you drive, and can do 80mph+ on the highway. Trunk roomy enough for a (disassembled) electric scooter.
Cons Lots of road/wind noise at hwy speeds, odd vibration felt at around 65-70mph, no torque to speak of at low revs, which means it's easy to stall at stoplights. Stereo lacks oomph. Seats are low and are very solid, not especially comfortable.
Summary Not bad for a hybrid. More spirited than a Prius or Insight, but less economical since it's mostly powered by gasoline. Electric motor is primarily there to help recover energy from braking/hills and even out your power consumption. Drive it conservatively and you'll see economy gains right away. Drive it aggressively, and... not so much gain in economy. But, a BIG improvement over a 6cyl Dodge Grand Caravan, either way, so if you don't need a big car or a minivan, then the Civic Hybrid should work well as a commuter hybrid.
Pros Amazing gas mileage. (51 mpg when I am driving it)
More than capable of hauling two pianos from Chicago to STL.
Great for sneaking down hills with autostop and honking a foot away from unsuspecting people.
Cons The keys cost a LOT to replace.
Hard to keep up on the highway in the mountains.
Summary Well, I love the 2005 Civic Hybrid. In reality, for what it is built for (and much more) it does it well. Also, the gas mileage can be MUCH IMPROVED by using premium fuel, and driving more carefully. The trick is not to let the car go above 2,000 RPMs. If you do this you will see gas mileage far above the 48 it is rated for. The perfect speed to stay at for the optimum gas mileage is 42 mph. As for the highway, the 47 MPG for the one w/ CVT is very generous. On the highway expect around 41 MPG. With a trailer, it can also be used to haul stuff (like two pianos.) On our trip, this dropped our gas mileage to about 31 MPG. However, I don't think you will ever see a truck doing that.
The braking power is phenominal, and hard enough to leave bruises (from the seatbelt) if you use the brakes to their maximum ability.
Pros 1) With stock wheels and tires it gets 48 mpg
2) Very smooth shifting 5 spd
3) It even has cruise control
4) The E-con system is cool and easy to use
Cons 1) Stock CD player only plays about 4 songs on each CD
2) Hard to find after market items for the 1.3L engine
3) Hard to hear engine during acceleration (that can be remedied - Vroom, vroom)
4) Road noise in passenger compartment
Summary I'm 61 years old and I went "Green". I purchased a nice set of after market wheels and tires (215/50R-16) but I lost 8 mpg for time I have had them on.
I had the windows tinted by Ziebart.
I put on wind deflectors on all four doors.
Nobody said "going green has to be dull".
With a little preparation anyone can personalize their Hybrid and have a fine looking automobile.
This car will buy back all items you put on it with the gas you save.
I'm sold and looking forward to the 2009 Hybrid CR-Z