I added Liqui-Moly Ceratec to my first oil change on my Taos SE 2022.
On the return 200 miles of my recent trip I recorded 40.2 mpg. An increase of 5 mpg over the best highway mileage before the additive.
x2, don't want to give them any reason to deny coverage should something go awry.I wouldn't use any additives on a new car under warranty, Ceratec is good stuff but you aren't going to see a 5mpg gain from it no matter what, it's just coincidence since you were doing a long distance drive. Speed, road surface, elevation change, whether you're following someone for long periods on the highway etc will all contribute.