It seems your tire air presure should read higher when the car is on the ground instead instead of when its up on a hoist. When my tire pressure is checked on the hoist its the same as when its on the ground.
Because you are not changing the volume of the space the air is in-only the shape-the same VOLUME of air (not pressure) in a larger tire has less pressure-smaller tire has more pressure-get it?
first answer was good. Even on the ground you can notice the front tires are compressed more than those in the rear. This is especially noticeable in a pick-up truck with a light bed in the rear and heavy engine in the front. If you rotated the tires would you expect the pressure to change?
