Generally the amount of space in the car... i.e. can you fit in comfortably?
The 2013 Dodge Dart has 42.2 in. of front leg room.
The 2007 Kia Optima has 43.7 in. of front leg room.
The 2011 Audi Q5 has 41.0 in. of front leg room.
The 2013 Lexus IS-F has 43.9 in. of front leg room.
The 2006 GMC Savana has 34.8 in. of rear leg room.
The 2009 Hyundai Elantra has 35.0 in. of rear leg room.
The 2012 Chevrolet Suburban has 39.5 in. of rear leg room.
The 2004 Mazda MAZDA3 has 41.9 in. of front leg room.
The 2003 Ford Explorer has 43.9 in. of front leg room.
The 2006 Nissan Maxima has 43.6 in. of front leg room.
The 2014 Mitsubishi Outlander has 37.3 in. of rear leg room.
The 2014 Chevrolet Cruze has 42.3 in. of front leg room.