Brand of tires on the EX?
Goodyear Integrity
Is there a fixed spot to store the headrests for the third seat (particularly that 3rd headrest)?
In a compartment under the flooring behind the 3rd row.
Is there really room for 3 in the backseat?
Honda readily admits that the 3rd row is designed for kids and smallish adults. Hence the reason in the EX-L the 3rd row in vinyl.
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