Not normally. Most stations use just plain ordinary air. Some places are starting to use nitrogen in the tires.
those places that do use nitrogen, do so as to reduce loss of pressure over
a much longer time-period, as supposedly, the molecules are 'bigger-fatter'
than those in regular 'air' /so I've heard/--and 'those places' sometimes
replace the valve-stem-caps with bright green-ones as a visual tip-off,
although who knows if that nitrogen was replaced /for some reason/ by
yet another place, months later. one would hope they change the cap to
black again, if so air only was used to re-inflate.
My new Chevy Equinox came from the dealer with helium filled tires. Since this cost money,what happens on a trip if they leak and I need to add air?
No
Helium is lighter than air. So, tires filled will helium will help the tire rise up in the air.
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.
Hard rubber.
Yes
I had my Team Dynamics 18inch with 225/45/18 filled with helium and it was remarkable,it was if the car was floating,lighter on steering and ask yourself why do F1 cars use it.I also had Tyre Sure sensors and digital display telling me tyre presser and temp and found they warmed up quicker than just air.
It is good to fill the tires of your car.
Yes, the type of tires always matter when it comes to a car. The tread on the tires depend on how it grips the road and depending on which type of tire you have determines how well the car handles on the highway.
Race car tires are super sticky. And when I say sticky I mean like GOO. A pebble pushed onto the smooth tread will STICK there. These tires are not legal for street use.
While it is good to use tires with the same tread and sizes, it is possible to use tires with different tread patterns, though you should be careful as the performance of the two tires may be different, causing your car to be unbalanced, endangering your passengers.
they are filled up with regular air that our tires use but some cheaters in monster truck racing fill their tires up with water to make sure they land on all fours.