I have philips xtreme vision on mine and the difference between it and the bulbs hyundai provided is amazing i do not need a torch no more.
Btw try getting the tire pressure to 32 and see the FE
i dont think the nitrogen guys theory of air being in the pipe is true just get it checked from another dealer over inflation is just as bad as under inflation, there is a page on it in the owners manual which tells you how to check if you have the right pressures.