1st 1,800 miles, only smell our '23 brand new 6.2 Suburban 4wd High Country had was the leather seating, no "burnt" smells.. and I'm very sensitive to any smells.
Re: Transmission whine, I drove a new '23 Tahoe 6.2L High Country 4wd for a month, and yes its transmission had a noticeable whine...