I'm trying some tips mentioned by these hyper-milers. One of them is to turn off the engine while approaching the intersection with traffic light on red. Sometimes due to the distance, I lost the power to brake. So I tried using the 2nd gear to slow down the car. (Note: I only do this with enough distance between cars, or I would rather turning the engine back on.) A few times I found the power gets back up again. Initially, I was wondering if I did turn off the engine and then realized that this is the same as push-jump start a car.
So how does it work? Why would the engine start up again without involving the starter?
Thanks,