In February I purchased a 2000 Honda Insight MT with 65,000 miles on it. The car has its original IMA battery pack. I get 55 mpg in the city and 60+ on the highway. Honda warranted the Honda Insight IMA battery pack for 10 years or 150,000 miles.
While Honda does charge a lot for a battery pack replacement there are already places that do refurbishment as well if not better than the dealership, at a far more reasonable price.
My father-in-law has a 2000 Honda Insight, and was able to drive from Iowa to Texas on a tank of gas- averaged I believe 65 mpg. Downside to his car is that there really is no back seat.
When my car was totaled in a wreck and my husband's started having electrical issues the same week, we went car shopping and ended up getting 2009 Honda Insights, the middle grade model (I forget the exact model type). Frik and Frak (our twin cars, just different colors) have back seats (traditional sedans), do not need plugged in (batteries charge by brake usage), and have extended warranties on everything including the battery packs and hybrid engines.
Hubbie went from filling up every 4 days to every two weeks (depending on errands and side trips), and I went from every week and a half to every three weeks. I average between 40-45 miles per gallon in city highway traffic (DFW metroplex, so sideroads plus normal highway cruising plus stop-and-go traffic).


He has close to 15,000 miles on his car while I have a little over 7k.
I have found that Frak (my car) seems to like Chevron and Shell gas more than QuikTrip or Vallero, enough to raise it 3-4 mpg, and I swear it runs better when put it through the car wash...
FWIW, my previous car was a 2007 Ford Escape Hybrid, and while it was a bit better on mileage compared to a regular Escape, it did not get near what it was estimated to get on the EPA rating in the two years that I had it- no matter who was driving. And I was driving a lot more during that time.