Not meaning to be an echo, but.... 4000 RPM????? What the heck are you doing, locking it in third gear in manual mode on the highway???? If that's not what you're doing, then you have a serious transmission software problem that needs to be repaired immediately. Get it back to the dealer as soon as possible. 8-10L/100km highway and about 14L/100km city is about what it should be.