Replacing tyres can be a costly hassle and careful driving will only preserve them so far. The front tyres should go beyond 20,000 miles with average driving, and the rears will go a lot longer on a front wheel drive car, so why not exploit this and rotate the cars tyres. It’s also a good way to avoid uneven wear that could shorten the tyres lifespan. Before you move your cars tyres, check their construction type as cross ply and radial tyres shouldn’t be mixed on the same axle and never use radials on the rear with cross ply on the fronts.
For front wheel drive vehicles (the most common set up for road cars) swap the fronts to the back, keeping the tyres on the same side and swap the rears forward to opposite sides. Rear wheel drive vehicles (most BMW’s, Mercedes, some sports cars etc.) should have the rear wheels moved to the front on the same side and the front tyres moved back, swapping sides. For four wheel drive vehicles like SUV’s, swap all tyres diagonally around the vehicle.