2013 X5 3.5 Premium LOW MGP

I recently took notice of my gas consumption on my new X5. I currenly have ~500 miles on it and cheched the onboard info. To my suprise my MPG is only 12.9. I think sticker has it 16/17 city and 22/23 highway with an average of 19. I forget what the exact numbers are, but still i would think my MPG to be closer to 16 if not just over it on an avg base. Am I missing something here? My drive is usually local with occasional stretches on the highway.