In response to the story on “eco-assist” systems, which help drivers lower their fuel consumption by driving more smoothly, Babbage remembered freewheeling down a Swiss mountain in an old Volvo 440 ...

With its new start-stop coasting function, Bosch enables drivers of vehicles with combustion engines to travel in zero-emission, noise-free, and low-resistance mode over large parts of their journey.

This works in the old Prius too. I was able to get 45 to 46mpg going ~80mph on the freeway for long trips.