Since running this test, of course I've been killing the engine more for coasting than I used to.
My segment mileage, according to the
SG, has shot way up. example:
68.1 mpg (US) over 30.5 km of sub/exurban driving (23 mph avg speed / 42 mph max; rain, wet roads; 6 C / 46 F ambient; 1.25 hrs EBH.)
This trip was above the 70 MPG level on the way back to the house, and then I got hit by 3 red lights in a row and a train crossing at the bottom of my best hill, and these things dragged it down to 68.1
It's obvious that through using engine-off coasting, a driver would see the "hybrid FE flip flop": where non-highway driving FE is going to exceed highway-only numbers. And largely for the same reasons (hybrids shutting down the ICE at every opportunity in low speed conditions).