I think you will see every car with some kind of eassist
just to have the a.c. , ps , and stop,start features run off a larger battery
once it on every car the price will drop a lot
Agreed 100%, whatever kinetic of friction energy can be recouperated. I would add solar energy, decoupling alternator when battery is full, regenerative braking (of course). Those are all fairly inexpensive solutions that may have a significant cumulative effect. My gripe with eAssist is disbalance between effect on fuel economy and compromised utility.
I checked out the Prius last weekend. Sure the battery is big but Toyota did an admirable job by adding folding rear seats that fold to form a flat surface with the floor in the hatch for all types of cargo. That's what I call engineering, making things work together to serve a purpose rather than slapping parts together at the expense of everything else (performance and utility) just so they can use the buzz word of the day.