Normally just air, unless you get your tire company to inflate them with nitrogen, which many people claim is better.
Yes.
Inspect the front tires they may have a bubble on one of them it is possible that a wheel bearing is going out but the easy check is to inspect the tires after you have driven it a few miles
Your universal joints are shot, get them replaced asap!
Radon gas.
fuel pump is located inside the gas tank.
It is what fills the tires, in the form of air.
There's moisture in air. When you fill your tires with compressed air, the moisture goes in the tire too. Moisture then has potential to rust out the rim from the inside. They use other gas (nitrogen?) that doesn't have moisture. Usually garages will put green air valve caps on tires filled with gas.
will tires make noise if there choppy on inside
Tires last longer and work more efficiently when the wear is even. Gas milage improves as well.Rotating the tires will extend the life of the tires.
Maybe, the manufacturer optimized the tire size to the vehicle, if your currently running larger than stock tires then you could be decreasing your mileage. Check the inside of your drivers side door for a placard with the correct tire size and inflation.
Nitrogen
Nitrogen.
Nitrogen
It is nitrogen.
Nitrogen, because it is an inert gas.
If you go too big the steering tires will rub inside bodywork.
nitrogen