Some car seats have more reclining positions than others, and some are a little wider so they will take up more room in your back seat. (strollerlab.net)
I have taken it twice now and the leg room is more than adequate, slightly more recline in the seat, and a general feeling of more comfort. (seatguru.com)
But at least you'll get 4 inches more leg room and a little bit more recline to the seat. (petergreenberg.com)