If I add more air to my tires will it make the car lighter.
NO, and if you add too much air to the tires it can eat up gas faster or cause a potential blow out. Check the owners manual and make sure the tire pressure is as they suggest.
No. The tires will explode and you will get hurt really bad.
Sure, if you add enough, you'll be able to drive on water.
No. And depends on what road conditions you are using the car.
Fill your tires with helium.
No. And since air has mass, believe it or not it will actually make the car a tiny bit heavier!
no.......inflate tires to recommended pressure printed on tire. to little or to much is very dangerous. good question. those kind of questions saves lives.