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I think they can only use it for a limited number of seconds per lap.

Not really. The drivers will always push to the limit and once they will go over it it will be a disaster that not efficiency can stop anymore.

Now that looks way better than the Christmas trees we saw for the last few seasons (it started sometimes around 2003 IMO).

No way.

If the fastest cars are at the back of the grid they will have to fight their way through the field and they will always have first of all to pass cars that are close in terms of...

Yeah it is optional, and teams have to do their calculations to see if a more balanced KERSless chassis would give better or worse times that one with KERS added and most importantly 100% functional....