Review on Goodyear Assurance All Season Radial Tire Tires & Wheels for Tires by Daniel Ogbebor

Not sure what the problem is but I ordered 4 of these tires from here and fitted them to my Sonata which they told me would fit. The technicians have tightened and aligned it and it's all set up for a smooth and enjoyable ride, but I haven't gotten this ride yet. The car shakes at very low speed, I have to accelerate to get the car moving and my gas mileage has gone down since I put these tires on. I've spent money twice to have technicians check and reinstall them and they find nothing wrong but the ride is uncomfortable. I'm not sure what the problem is, nor are the techniques. I don't know what to do now.