Ford has stated in public documents, that part of their control strategy was to make the car "feel" as normal as possible, and to make the hybrid part of it to be as transparent to the driver as possible.

Ford has stated that part of their programing was to not have too many switches between EV and ICE, switches that may become an annoyance to the driver... wheather good for FE or not. The Ford car, by itself, will not go between EV and ICE in intervals shorter than 30 second of each, for example. A driver can, through driving methods, coax the car into EV with intervals of less than 30 seconds of ICE, for one example.