I used to own a Honda Insight and now own a Prius. Yes, the reason the
former is no longer sold is that it only seated two people, you could
never carry a child due to the air bag, there was very little storage
space, and it lost oomph going uphill on freeways. It was also a pain
to get into.
I got usually 55 mpg (? L/100 km) on the Insight, and usually 50 mpg on
the Prius, which has lots of room, is loaded with safety doodads, and is
really a much better car. Its gasoline engine is 1.5 L vs the 3 banger
1.0 L on the Insight.
But the Insight was perfect on metric conversion, whereas the Prius is
sadly lacking. On the Insight, a push of a button converted EVERYTHING
to metric. Boom.
If you are thinking of buying a Prius--do it now.
HARRY WYETH