Torque News is doing a long term test of the Michelin CC2. This is the first report I have seen reporting a fuel mileage increase with the CC2s (0.5mpg, relative to the Toyo A36 OE all season tires)
My experiences with the CC2 is about the same as many of you. I put my CC2s on in Nov of 2020 and have liked them since. Great all around tires in all conditions so far (better then the Michelin all-seasons it had.) I wish they were a bit better in the icy hard packed stuff, but with a ~370HP/395TQ car its hard to ask for more MPG are about the same as before, but I'm not a timid driver unless I need to be. I'll have to check the tread but they haven't worn much at all...