 I bought my 09 sonata used with 70k miles and have had no issues up to 96k miles during my ownership. It's reliability gives me the greatest sense of relief.  For what it is, with its smaller v6, it really likes to show off if you let it. With good summer tires, and traction control off and in sport mode while manually shifting, on takeoff tires are almost garunteed to spin a little, very vocal. You can also get tires to spin in motion if you drop into first under 20 and hit it. No it's not a performance car. But I have beat Mustangs, G35s, TL (Older than 2013) Audi A4 & A6, MazdaSpeed3, and many other comparable V6s. Over 4000 rpm you can feel the valves open completely and a small surge in power. The addition of VVT was added in 09 I believe with direct injection. Gas mileage is great for all of this. And runs on regular.