The best tires for a small car would be the ones that the car manufacturer recommends you use on the car. If you keep good tires on your car and check them every now and then you will get better gas mileage.
because they would be flat and you would be screwed
well there really is no other way to inflate an inflatable object
Nitrogen
Nitrogen.
It is nitrogen.
Street cars air (which is manily Oxygen, nitrogen), race cars nitrogen.
F1 teams use Nitrogen to fill the tires because of its low dilatation compared to air, a small dilatation in a F1 tire will result in unbalancing the car.
Nitrogen, because it is an inert gas.
that depends how you drive the miles on the car how the car has been maitained how the car runs the tires and the gas you use
It's just regular air.
most used is nitrogen..