At the beginning of your ownership, avoid staying the same single speed for long periods of time. For example, I don't advise buying the car and making your first trip a thousand mile vacation trip on the highway staying at the same speed like only 65 MPH 90% of the time. The typical recommendation from manufacturers (I don't know what Genesis says) is to take the new car through more changes of speed and avoid RPMs higher than 4K so that there are no excessive single-wear engine points of metal to metal contact. I stay aware of that for the first 3-5K miles, then drive without concern. That's my personal pattern with new cars so I have no doubts that I've broken it in gently and evenly. Some will say no break in at all is required. I like to be on the cautious side. My gas mileage typically keeps getting better and better up until 15K (when it stabilizes) after this care. My GV80 3.5, which started at 22.4 maximum highway mpg when brand new, is now up 26.7 mpg at 90% 55-60 mph driving mixed with 5% slower traffic driving (Comfort Mode). This is at my current total GV80 mileage of 7,100 miles so far. At this rate, I will not be surprised if the car will break 27 mpg for highway driving. Frankly I'm very happily surprised and amazed with these results. Hopefully, the car's electronics is reporting mpg accurately. I did not use outside automotive testing equipment nor fill up the tank and see how far it will go. It was a slow steady increase in mpg over time.