Apart from retaining heat in the engine when ICE is off, gliding is key to good milage in the Yaris Hybrid.
It took me a long time to figure out how it's best done, but now that I've found to teknique it's quite easy and effective.
As on whiches to enter a glide, ease off the speeder to the point where neither ICE og EV motor is pulling. It's a bit different depending on the speed, but usually on the "ECO" meter it just below the on on ECO on the meter.
Keeping the needle there the car will glide.
On the left meeter, between CHG and E in ECO is the zone where the can can enter a glide. Nearer to the E than to the C.
And it glides well, and it acounts for some of the improved milage on the last tank.