Average male is 5'-9" And why must you sit behind yourself? I don't get this. Is everyone you know 6-1?
Snowman is .. 6-3?? He fit in my ISF no problem.
Not everyone I know is 6'-1". HOWEVER, it's my standard, especially considering the 13 y-o who lives in my house and eats all my food will probably be 6' once he turns 15.
When you're a single car family, and you insist on driving Sedans, rear seat space is a rather large consideration. My point is, there's a decent selection of both Mid-Size Mainstream, AND Mid-size Luxury sedans behind which I CAN sit behind myself, allowing me to rule out the ones in which I can't and still have decent choice.
For the Record, the Fusion was one in which I had difficulty, so it would likely be ruled out on this basis alone as a family car for my family.