Most of them think Hyundai cars are not fuel efficient but i can say they are wrong. If u drive economically it can go more than 650km++ full tank. I've driven to Genting in my Hyundai Sonata EF with full tank. I didt speed but drove ard 120km/h +/- rpm not above 2.5. When i reached the top i still had 3/4 of fuel in my tank. It all depends on how they drive. Hyundai cars tend to rev a lot even when u step lightly. Cos the body heavier.