2015 Buick Lacrosse - Adaptive cruise control. There is a user setting for adjusting the gap between vehicles which can be set to close, mid, far. Even at the far setting my buick follows at about 1.9 second gap which is much to close for on the highway travel. Is there a way for a dealer tech to adjust this gap so it can be at 3 to 3.5 seconds. please help , thanks