 There is nothing wrong with staying in recirculation mode all the time unless you're a smoker because then you will never evacuate all the smoke in the car because you're recycling 90% of the air and only bringing in 10% fresh. If you're not a smoker, you don't have any bad odors in the car, you don't have the chicken wings left from three days ago on the floor baking in the sun. Those are still good three days ago. What are you talking about? Five days in my role.