most used is nitrogen..
Nitrogen
It is nitrogen.
Nitrogen.
Nitrogen, because it is an inert gas.
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.
It's just regular air.
nitrogen
nitrogen
Nitrogen and oxygen = Air
Nitrogen mixed with normal air
because they would be flat and you would be screwed
Yes, the tires will ruin your gas mileage overall. Bigger tires weigh more and they're harder to rotate on the vehicle even though they gain greater traction.