For what it's worth, I have a 16 Optima LX, w/2.4l. Right now, has a little over 32K. Ran it down to Myrtle Beach this summer from NY. I used the Eco mode, cruise set at 68mph. Best mileage was almost 43mpg. Average for total down and back was around 36.5mpg. This consistently gives me around 34mpg around town. (have all fuel receipts)We have a 2019 Optima with the 2.4 engine. We have put 3,011 miles on it, so have not driven it enough to check fuel mileage. What are you guys getting at 70 mph on the freeway on a long trip?
My computer is optimistic by a couple of MPG. Unless you're using actual mileage vs gallons filled I wouldn't bother posting it as gospel.