My stock '09 ZRE yoko tires are approaching 50,000kms and will need replacing soon. As others have said, driving behaviour, tyre pressures, balanced tires all play a part. Checking constantly increases tire lifespan. And yes, the older Corollas (AE82/AE92 800-900kg) weigh less than the newer Corollas (1,200kg). This is due to more features/gadgets and it being bigger in size.