 I am almost at 80,000 miles on my Sonata and I still haven't had one problem.  Just had the car detailed and it looks great - almost no signs of wear.  This is right around the point where my Mercedes started having crazy electrical problems but I think my Hyundai will go until I want to replace it with something more fun.  The real debate is whether to sell it before it hits 100k miles or drive it into the ground - which could be years.