Hi guys. Need some advice. A couple of weeks ago I added the GM - Brembo big brake kit on my 2022 RST 6.2. I only drive the vehicle in weekends and have placed roughly 100 miles on it since adding the brake package. Problem is, I can clearly sense a difference with drivability. I understand the larger rotors may weigh more and possibly even the larger caliper but My G-D!! My mpg is now at 12!!! My acceleration seems labored as if I am towing something. Never have I felt this in a car. Even the acceleration sound driving normally seems as if my engine is working harder. I ultimately went back to the dealer where it was installed. They placed it on lifts and stated they see nothing wrong because the wheels / rotors are spinning freely. After driving for an additional 30 miles with mpg plunging to 11, I have made an appointment and will not accept any other excuses from them. Not sure what the tech may have done. Dragging calipers, brakes not fully releasing? Is it possible he may have tightened something too much where my ebrake is slightly holding or something. Any ideas or thoughts would be greatly appreciated. My steering feels heavy also and it just seems as if more weight has been added. Really thinking of removing these things and getting my lively RST back to stock.