Hankook Eco tyre wear

11k miles ago I replaced my fronts with another pair of Hankooks. The replacements are Hankook Kinergy Ecos and I checked the depth to see how they were wearing. The nearside had 5mm of tread remaining while the offside had slightly less 4.5mm across the tread. There is no any visible scrubbing and the car drives straight with no left or right steering bias. I would have thought that the nearside would wear the most as the road camber would throw the weight of the car onto that  tyre. I replaced the rear nearside due to the walls cracking as it was a factory-fitted tyre and was 6 years old. The replacement Hankook Eco tyre only has 7mm of tread which is less than the customarily 8mm.