Real life MPG anecdotal info to add re 2023 Tucson Limited with about 2700 miles on the odometer:
Full tank in Camp Verde, AZ. Took the "back roads" (AZ 260 and 87) from there to hit I-40 in Winslow.
Climbing up through the mountains and Coconino National Forest to an elevation of 7500 feet, very winding roads, average 50-55 mph speeds, and significant uphill stretches, for about 85 miles. MPG meter read 19.2.
Then it was time to head downhill. Obviously MPG kept improving and about 40 miles from Winslow, the road flattened out completely. I could switch to cruise control and set a steady 65-70. By the time I reached I-40 and stopped to refuel, the MPG readout was 32.1. To me, that was pretty good for the combined (and very different) terrains.
From there to Albuquerque (about 250 miles), the overall MPG stayed around 31.
I'm thinking that much as I'd like it to be a little better, not all highway driving is the same. On I-40, a truck pulls out because they really need to pass. We all slow down. Then it's a "sprint" to get back up to speed. And this means downshifting and the engine gulping more gas. There are a LOT of variables. And although I tend to compare it to my 2014 Sonata Limited I sold to buy the new Tucson (LOVED my Sonata), I must keep in mind that it was a much more aerodynamic vehicle, which I kept in tip top condition. "She" could get up to 39-40 on a long trip, but wasn't any better around town that my Tucson. So I think it's all relative and varies with the conditions and the driver.