AuditorBill----Keep in mind that the back of the 'Nox that is the "trunk" is open and channels all that road noise into the "cabin" seating area. On the Cruze it was somewhat isolated unless you had the rear seats folded down. I found my old (2014) Malibu was much noisier with seats down while carrying large items. Similarly, my Camaro has increase road noise transmitted forward when the seats are down. As others have mentioned, tires can also make a significant contribution to noise--and it may increase/decrease as you put more miles on the tires. Good luck n isolating to your comfort level. Dynomat may be the solution, but I don't have experience with it in mine.
2018 Premier, 2.0T, Cajun Red