I am pretty sure if mouser ever gets himself a girlfriend, he is not going to want to shove her in the back seat of an Elio.
Plus, I am not sure that thing is capable of hauling home the lumber for building more bookcases.
Or groceries, for that matter. The trunk is only big enough to hold an airline carry-on bag. Might not even be able to fit a 12-pack of toilet paper in it.