I put new tires on my car when I bought it at 19,500 miles. I'm now at 43,000 and the tread on my tires is really low. These weren't performance tires or anything but normal H ratedToyos that I think were supposed to get around 50,000 miles. I definitely drive harder than most and almost all the tread is gone around the outside which I heard can be from hard cornering but I don't drive extremely hard either. I think for a while I was underinflating my tires cause I was putting in 29 psi like the manual said but that was cold air pressure and by the time I got to the gas station the tires would already be warmed up. Could it be something like the balancing or alignment thats off?

 

Have your alignment checked.