Hi I have a 2013 Focus st with 67k miles. Only after markets on it is Borla Catback, Air Intake, Cobb Stage 1 93 tune. When Im at an idle ive noticed the wastegate is always slightly open like .75-2%. While im cruising on the highway it is constanly open at around 55%-70%. When I go full throttle it drops to 45% and opens up to 70%-80% like normal. My gas mileage has been really low around 22mpg. I replaced the Boost Control Solenoid with no change. I tried looking at the turbo from under the car and from what I could see everything looks ok. Any ideas on what I should check next? Thanks!!!!