Won't hurt it, my dealer fill them up with regular as a practice. Have driven many times with regular on long trip - no performance issues but the mileage does drop a "wee bit."

Grew up in NJ and have been out of state for about 10 years - can't believe they still mandate full service. The best was when I had a diesel 300Td MB that some idiot filled with regular gas. Had to drive from Hackensack to Bedminster and it was at night. Didn't notice anything until the car started to buck on Route 80. Was really fun getting home. Next day was even worse - drained the tank and had to clean the filters.