We have an Ipsum as well and I like the size for a family car. We looked at the Wish, but decided it was just too small for us - when the back seats were in use, there was no luggage space... With the Ipsum, there is still space and if we just need one seat in the back, we can fold the other down and have more storage.
As a comparison, it costs about $100 to fill our Ipsum from completely empty and we generally get about 500k on a tank for city driving, closer to 550 - 600k for open road. It's a 2001 so not a really new model either.
Main drawback is that the middle seat in the middle row is a lapbelt, so really only usable with a carseat - not a problem for us though b/c we'll have a carseat there for the next 4 years anyway!
