I've been an Insight owner since 8-2004, 64k mi so far. My average mileage the last 10k mi or so is 72.7mpg. I have a manual with A/C. I just pumped up my tire pressure to 44 lbs. and put in a radiator block in an attempt to boost my mileage back up, as it drops every winter. Lately we've been using it for shorter trips, so the average tankful is down to about 62 mpg. I drive it very carefully, so in the summer on long trips I usually get at least 80 mpg.
I love this car more than any other. In fact, after buying it, and getting only 64 mpg average, I decided to drive purely for mileage, and it improved 10% and I enjoy driving much more now that I'm not trying to get there first like everyone else.
I just bought, but haven't received, a 93 Dodge Tevan, all electric Caravan, with 6k mi and ni-cad batteries. I also got an Oxygen scooter with nickel-zinc batteries that goes 30, and I love for short trips.