And for me, it's not even a commuting vehicle - it's a "haul Robbie home from daycare on days when it's not safe or possible to walk, and haul Robbie to and from Mom's on alternate Fridays, and general errand-running and grocery-shopping" vehicle. So an SUV makes even less sense. I would like a four-door vehicle, because two-doors are a PITA when it comes to inserting and removing child from carseat, but it doesn't need to be big at all.
My commuting vehicle is a great big hulking bus and train combo, which probably gets <30 mpg, but on the other hand hauls a heck of a lot of people to and from work, and would run whether I rode it or not.