I don't understand his reasoning either. This guy seem to forget that Audi really turned down the consumption (and pace) at the end of Laguna to avoid a last splash and dash. And Audi still had its 90 litre tank; only the refuelling restrictor is smaller.
9 litre less fuel indeed means around -9 kg when the tank is completely full; in the middle of the stint it will be 4.5 kg lighter. But the R10 is already 10 kg too heavy.
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