@roger,
The Fit has been great for the dogs - the salesperson had me bring them in to test getting in and out before I committed to the purchase. Bailey liked to travel on the security cover for the hatch of my Civic so they brought in a security cover for the Fit from another city (Toronto had run out) for Bailey to test out even before I'd agreed to buy.
I'm surprised by how good the mileage is. On my first road trip, I thought the fuel gauge was broken.
As much as I like to have access to acceleration, I'm a pretty smooth driver - I don't brake a lot and I don't slow down and speed up - I find my spot on the road and stick to it. One of my fun challenges is how many green lights I can hit in the city by staying e.x.a.c.t.l.y. at the speed limit - makes for smooth driving and terrific mileage.