 I had a 2009 Sonata, and a 2012 Sonata, with no problems. I never had them back for any warranty work. This is not the case with the 2015 Sonata.  I have had the car for just 1 year, and have been back for warranty work 8 times now.  It is the Last Hyundai I will ever own. Had it back 3 times to fix the rear window defogger switch. Twice for the right front brake caliper recall.  How can  it be that Hyundai does not have the part in stock for a recall item.  Service manager told me they can not order the caliper until they are sure I needed one.  If that is truly Hyundai's policy on a recall item, then I don't want any more Hyundai's.  I had the car back three times to get the front passenger seat belt fixed, and it is broken again. As far as the gas mileage, I get about the same as I did with the 2012 Sonata, even though the 2015 is suppose to be 2 MPG better.  Acceleration is not as good as the 2012 had. The ride and comfort level is good, a little better then the 2012 had. Last time I will buy a first year redesigned model.