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This is correct. It's also how they really deploy ERS at Le Mans (on the straights exclusively). I'll try to find the article (I believe it was in Racecar Engineering print mag) where I read about it.The trick is how to use/deploy the ERS. I rather set it in "charging mode" and use it as KERS.
The minus is your acceleration is slower, but you can deploy most of the battery on the mulsanne straight and the back straight on Circuit de la Sarthe.



