There have been a number of posts that have addressed tire replacement when its time to replace all four tires. I have not seen any discussion on only the fronts. In my case I am at about 32K with 3/32" left on the fronts but 7/32" on the rears. When I went in for my 30K service the manager showed be a Volvo Service Manager Bulletin (Group 77, No. 7) dated 1/26/12 entitled Tire Rotation.
As has been previously posted Volvo does not recommend any rotation claiming it is always better to have the greater tread depth available at the rear to avoid oversteer under hard braking or cornering. They also state that the front and rear tread set is different in angle and rotation can lead to increased wear and sub-optimal handling and feel. Also that driving performance will suffer as will noise and fuel economy. Finally they state that suspension problems are more easily diagnosed and detected when tires don't get moved.
The result was that the recommendation was to only replace the fronts using the same model as original and then place all four with your tire set of choice the next time the fronts need it. Thus my question is - Is this consistent with others experience and a reasonable strategy or is there a better approach? I should say that I am on the West Coast and thus have an FWD model which has yet to see snow and that I would probably go with the ComfortTread modesl when I replace based on my research and usage.