From the day that you have new tyres on your vehicle it is important to track the tread depth and how it decreases over time. It is good to keep a log of the tread depth. Initially you will not check it as often, perhaps every 6 months, but once you start to predict they are worn out you should check them more often. It is also important to track differences between the front tyres and the rear tyres. If there is a big difference in the wear between rear and front tyres, you should rotate the tyres, so that the difference can be eliminated. This is what is referred to as tyre rotation. If you use two sets of tyres during the year by using summer tyres and winter tyres, then it is natural to do the rotation at the instance that you change them.
If you use the same tyres the whole year, then you will need to manage the rotation by tracking the wear through the tread depth and change when the difference is between 2-3 mm. If you have a hybrid or an electrical car, the tyre wear is higher due to the higher torque. This means that it might not be enough to rotate every 6-month, especially if you drive a lot. So it is even more important that you monitor the wear. Special tyres should be used for these vehicles that have a higher wear resistance.
There are other factors that can impact the wear of the tyres; one is the tyre pressure where a low tyre pressure increases the rolling resistance, which increases the tyre wear. It also causes the vehicle to consume more fuel when you drive. So this is important to check when you stop at a petrol station for fuel. Cheap tyres will also wear faster also due to their higher rolling resistance. This means that cheap tyres will wear out faster and will cause your vehicle to consume more fuel. This is not a good equation and will end up costing you more money at the same time as you are driving with tyres that are less safe. So make sure that you invest in high quality premium tyres.