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When it comes to racing, weight is efficiency advantage no matter how you look at it and when rules favor efficiency then KTF was chosen to preserve that gain.
This way we can have petrol hybrid at 875 kg competing with only 2.7% more fuel energy against diesel hybrid. Your "ballast" way would mean petrol hybrid would need 6.9% more fuel energy to be competitive against diesel hybrid.
This logic would be also true if there would be no MJ classes (unrestricted ERS).
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