With Michelins, the X series are the better tires for comfort, noise, wear and fuel economy.
A couple things I noticed in the post are an increase in diameter and air pressure. When you increase air pressure, and there is not a load on the tire, the center of the tire will bow out, increasing the diameter more. Slight changes in the diameter and contact effect the overall fuel economy.
Did the fuel economy change right away, or has it been a few thousand miles since you last checked? Meaning, did you keep a constant rating record with every fill up, and did it change immediately after the new tires?
Reasoning: Other factors may be involved besides and aggressive tire and rubber compound. Alignment for instance. First one is due by 30-40k miles. Misalignment causes more frictional force on the wheel. Type of fuel used. We are in to winter blends which will effect fuel economy greatly. Temperature, both ambient and the engine temperature effect the performance of the engine. Colder temps = more fuel usage. And the same can be said about the temperature of the tire itself. Electrical loads. Heater, defrost, heated seats, heated wipers, heated mirrors, etc., change engine loads to a higher percentage.
Winter brings on higher fuel demand from the vehicles, especially the fuel. Switch to high octane fuel and see if it changes.