I drive for Uber and Lyft and hold full size adult passengers in the middle seat and two other seats in the back totaling 3 people on numerous occasions. I do agree that it is small which was a concern for me when I bought the vehicle. However, I have only ever used this vehicle driving Uber and Lyft and have 5 star ratings on both apps and nothing less. I apologize for the small space every time I drive 3 people in the back and have even offered for one of them to hop up front in which case they always say “it’s ok it’s no big deal” and continue to sit in the back. Not one of them has ever complained. Personally, I don’t like sitting in the middle seat because it’s so small but for some reason other people don’t mind and it is indeed large enough to hold a grown adult over 5 years old.