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@Buzz45, lolz, you are so wrong it's not even funny.
30% less fuel, more weight, less weight loss during the race, only about ~8% of the energy per lap will come from the new 4MJ KERS (before the electric motor).
When a kg of petrol is about 46 MJ before the motor
and a race of KERS would yield close to say 200-240 MJ, KERS is only amounting to 5-6 KG with respect to petrol... Multiply that by the reciprocal of the engine efficiency which might be as low as 33%, and its pretty insignificant when you are carrying on the order of 100+ KG of petrol, and having to add so much more weight, and benefit so much less due to lack of weight loss during the race (last lap vs first lap differential)