They are still a 'chemical' rather than 'mechanical' solution though aren't they?
Yes, but not if your foot is off the throttle? ;-)
Quite. ;-)
I think the idea was that some thought that to save fuel when they were going to be coming to a halt, they would slip it into neutral and cruse (on tickover), only stopping on the brakes (pre regen braking etc).
However, if the engine is having to maintain tickover it's got more throttle than if there is no demand for power and is being 'driven' by the inertia of the car as it decelerates.
Not really ever tried to do that myself, just something I heard that I found interesting. Strangely though, I think it might be better for a
2/ (tank mix especially) to idle than be spun at high revs with a closed throttle (but for different reasons). ;-)Cheers, T i m