Just joined up after seeing this site pointed out on InsightCentral. I picked up a 2002 Insight last February and have been enjoying the 70 mpg fillups since! My average over last 5500 miles since I bought it is showing 73.5, seems like it is slightly optimistic compared to conputed numbers, but I can't really say I'm disappointed!
My former daily driver was a 1993 Trooper. By driving carefully I managed to get mileage in the low 20's, so the Insight really stands out.
My wife liked those numbers, so in August I picked up a 2000 Insight for her! We're keeping her 4Runner for extra bad WX and extra seats needed trips.
I guess we've jumped in with both feet!
Looks like I've got some reading to do here...