The process, ANY process, of charging the hybrid battery is very lossy. Intentionally creating a need to recharge the hybrid battery, accelerate and then coast, "pulse and glide", is therefore counter-productive.

The modeling of the hybrid system during the design phase would have only involved inadvertent, unavoidable, use of regenerative braking, slowing and or stopping because traffic conditions forced you to do so. Not conditions, by any means, created artificially by modifying the way you drive a hybrid vs an ordinary vehicle while being conscientous of FE.

For instance if I could disable my Prius' techique of using the hybrid electrics during highway cruising I would be perfectly happy with the resulting slower acceleration rate of just the ICE in return for the substantially improved FE on the freeway.

Absent any modification of the Prius hybrid control system, if there is even a slight loss of cruise controlled roadspeed on the freeway the electrics will kick in and provide "boost" to more quickly return to the "set" speed. In 150 miles of relatively constant speed level freeway driving the hybrid battery recharge ICE cycle will be needed 6 or 7 times.

So the losses involved in charging the hybrid battery using the ICE and those involved in the use of the energy stored in the hybrid battery are a net loss. Neevr to be recovered. That's why hybrid hwy FE is so horrible vs an equivalently equipped/weight ICE only vehicle.

The electric drive motors are used each time even a slight level of (re)acceleration is required and then eventually the hybrid batteries will be discharged to the point that the system will default into using the very lossy ICE method to bring them back up close to the "top-off" level. Only "close" because the system always leaves some "room" in the event "free" energy become available via regenerative braking.

So, bottom line is that it is highly likely the best FE can be obtained by driving a hybrid in the same way you would an ordinary car provided you were being sensitive, conscientous, of the need to conserve fuel.

Being conscientous of FE, you would not be a leadfoot in the ordinary vehicle so why not exhibit the same technique in a hybrid?

Therein lies the best FE.