Modern cars are so well insulated it can be hard to tell when theres a problem especially when they are low profile.
And tyres cannot last long being driven when they are low pressure.
I drove to my local town recently with well inflated tyres (toyota avensis) 3 miles away. I turned round on an industrial estate lay-by to set off home and about a mile into the journey noticed they suspension sounded "clunky" and they steering felt a little stiffer. I decided I would pull over in the next lay-by and have a look. 400yds later I pulled over to find my passenger front tyre leaking air from a side wall hole at a high rate.
I changed for the spare tyre and took it for a new one the same day. I knew it couldn't be repaired as I could nearly fit my finger through the sidewall but I was suprised at how much "powdered rubber" the mechanic showed me inside the tyre which was the side wall wearing thin.
I just shows that tyres cannot last long being drove on flat.
Also my missus was driving the same automatic car the other day for the first time and rung me 2 miles down the road to say it was revving a lot. She had it in "drive" but pushed the stick to the side so it was in manual mode. Maybe its just me but a lot of folk have no idea when it comes to vehicles