 I purchased a 2013 sonata new last year and have been fighting with hyundia and the dealership ever sice over gas milage.Advertised is 24 to 35 with 28 combined. Best I ever got was 23 on a flat stretch of highway through ohio. Down to 10 in the hills. But according to hyundia and the dealership that is operating within specs.Would not suggest to by this at any cost