 I traded my 2002 Subaru in for this 2007 Sonata.  I barely made 4 payments  and now it sits.  Was driving home with my children, thankfully I just got off the interstate when I lost complete power.  With 4' snow banks along the roads I was lucky to get off the road.  Bought a new battery, only for it to drain completely the next day.  Bought an alternator, have been trying to replace for the past 4 days.  This is the worse design I ever saw!  Read on other blogs how Hyundai's are noted for blown alternators because of valve gasket leaks shorting them out.  Other Hyundai's have been recalled but not the Sonata.  I had to replace the alternator on my Subaru-took less than 15 minutes.  As far a gas mileage I barely get 19 mpg city, 21 mpg highway.  Very Poor. Don't know if I will ever get another. s