In addition to a high comfort level, the XL Denali had surprisingly good acceleration and plenty of reserve power even when cruising at interstate speeds. (articles.orlandosentinel.com)
It has absolutely no problems getting up to interstate speeds quickly and it handles more like a sports car than a SUV. (autolist.com)
We live in South Dakota were interstate speed limits are 80 MPH so if driven slightly slower it would likely average even better. (cars.com)