It all depends on how heavy you are on the throttle. Use Eco mode and keep the indicator out of the power range. When staring from a stop ease down on the throttle to keep the battery increasing your speed until the engine kicks in at about 25 mph. We have a 2020 Rav4 and have continuously averaged over 39 mpg.
We also have a 2012 Camry hybrid. We average 35.4 mpg. My son borrows it and only gets 29 mpg Because he is impatience and accelerates quickly from a stop never allowing the electric motors to work by themselves.