The seatbacks themselves don't fold all the way down, and the actual pass-through opening is pretty small. Plus the center seat belt can't be moved out of the way. For what it's worth, the Toyota Camry is guilty of this same crimes.
Fold-down seat backs, sort of 2006.5 Kia Optima LX
By Aaron Gold, About.com Guide
2006.5 Kia Optima LX - - Fold-down seat backs, sort of
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