In a simple words low tire pressure is a great enemy for the tires and it also effects fuel average . It not only destroys tires side walls ,case and also causes uneven wear of tyres.
When a tire runs on road with low air pressure its road contact area increases and because of this rolling friction/resistance increases and to compensate this vehicle utilizes more power intern consumes more fuel than correctly inflated tires.
Because of low tire pressure end portion of tread areas are rapidly worn out compared to middle portion of the tire.
