It happens to me every day because I keep my tires at manufacturer recommended tire pressure of 43 PSI.
I have also measured the gain to be almost 1 MPG compared to 30 PSI. My KM2s do feel slightly like riding on knobbiest but I got used to after a couple of weeks. The It also improves the how the acceleration feels.
The infamous chalk test just optimizes footprint but does not take into account tire loading which is much different high the load rating tires or fuel economy. The max tire pressure on my KM2s is 80 psi so going from 28-30 psi which the chalk test indicates to 43 psi surprisingly doesn't change the footprint that much. i always do a 5 tire rotation every 5k miles.
I chalk test like 15" wheels, CAIs and other old habits are hard to die.