I have a car with all four new tires installed at the same time 6 months ago. Three of them are identical and one is different (front right if this matters). Today, I noticed that the front tires have significant tread wear compared to the rear ones. I have checked several articles on diagnosing tread wear, but his type was not one of them. What could be causing this?
Assuming the vehicle is front wheel drive, more wear in the front tyres than the rear is normal as the the driving wheels have plenty more torque and stresses placed on them than the rears. Avoiding harsh braking and accelerating will extend the life of the tyres.
If the tire tread is worn evenly and you have a front wheel drive car, that's just wear on your drive wheel from acceleration. On some vehicles, one wheel is favored more than the other. If it's that significant, congrats on driving it like you stole it- nothing wrong with that.