How often do you use your back seat? If the answer is "Not a lot," then you should seriously consider a Smart Fortwo. The Fortwo packs in nearly as much front-seat and trunk room as a typical small car. But with only one row of seats, it's a good 4 to 5 feet shorter than your typical subcompact. That means it'll squeeze into those little half-spaces that even small hatchbacks have to pass up. And with just 1800 lbs to haul around, the Fortwo's fuel economy is 10 to 20% higher than a typical small car. It makes a great commuter vehicle -- when you get to work, there's no need to park it; just toss it into your briefcase with your laptop.