The driver's seat feels nice and comfy, even after two or three hours of driving. Not too much pressure under the legs by the knees, and not too little lumbar support. I imagine the passenger's seat is the same, but I so infrequently sit there I can't really comment.
see full Nissan Frontier review
I only rode in the back a couple times. Keep in mind, this is not a full-sized truck.
The legroom isn't much, but sufficient for a smaller adult or, if you keep the trip short, most anyone. The seat isn't really wide enough to comfortably sit 3.
Also the seating position is very upright - like church pew upright. I was not a fan, but I never sit back there anyway. :)
see full Nissan Frontier review
What Our Members Are Saying about the Seat Room and Comfort of the 2010 Pontiac G6
2010 Pontiac G6 Seat Room and Comfort: Cons
Year
Body/Powertrain
Comment
2009
4dr Sedan 219-horsepower 3.5L V6 4-speed automatic FWD
Extremely uncomfortable driver seat. This was the base model with cloth manual seats. They are too hard .
see full Pontiac G6 review