It is amazing. I get 30+ routinely without altering my driving habits, and 38 if I am on the highway a lot.
City cars rock. Short wheelbase so parking is a breeze, nice and tall so visibility is great and there is lots of headroom. Very unique. You get a lot of attention in these cars.
Great experience with Toyota in the past, and great reviews. It is still fairly new (2006.5) but there are none of the annoying little problems many other new cars get.
The room inside with the back seats down is amazing. Enough to haul furniture, move, take along major sports equipment or sleep in.