Doing a lot of inner city driving, another thing that can be a burden on front tires (other than alien alignment), is the excess turning the vehicle does. Especially AWD and FWD vehicles. Torque-steer puts some stress on those fronts and wear is always greater than the rears. A slight misalignment in the front and you are looking at quicker wear. Because of our wheelbase, torque-steer always seemed a bit high to me, especially on peddle mash on a turn-from-stop. Something to keep in mind since many people never even realize it.