how to change it back to mph
First, it's new and you have a warranty with Honda. Also, they have an obligation to see that you can operate the vehicle's controls. Look in the owners manual for personal settings and you'll find how to get to the option to reset to mph.
you call yourselves car gurus and all you post is demeaning twattle
I guess you call asking the owner of a new car to read his owners manual and get proper instruction from his dealer demeaning and useless guidance. I'll assume you're an illerate shut-in.