I just had to offer my $.02 to this discussion. I purchased a used 2003 Civic Hybrid with 50000 km on it two months ago, just in time for the high gas prices in Ontario, Canada. I simply love the car so far. The hybrid is loaded with features and is much quieter than the regular Civic. My gas mileage over the almost 2000 km is 5.6 l/100 km. My best was 3.9 on a 120 km highway trip. I normally drive about 1/4 highway and 3/4 city driving and usually get less than 5.3 l/100 km. However, I have a 17 year old daughter with a heavy foot.
Am I concerned about the battery costs at 160000 km - sure I am. But I think the price will be lower at that time and I know it is a solid car.