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I'm too lazy to go out front and measure it, but I can tell you that I can put 1 infant car seat in the middle, flanked by a 9 y/o and a 6 y/o and they are all comfortable.
Without measuring it, I can tell you I have two booster seats, with my 10 yo boy back there, and they all have room to move. It will be better when we get rid of the extra booster, but it works well.