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is there any ways to tell (visually or car performance) whether the tires are leaking?
There are several ways.......check your tire pressure when the tire is cold & wait 24 hours & check it again.
Many shops have a dunk tank for tires to catch even the smalles of leaks (it will produce bubbles). If you suspect you have a leak, I suggest you take it to a tire shop as this is probably the best way to find out for sure.