I'm sure there is a restrictor in the diesel filler system, to slow them down. I believe, it's so, in theory, a full tank takes as long for both.
As said though, some will still have not quite a laps worth of fuel onboard, so lose less time in fuelling to the top.
And, yes, I expect Audi to have the wick turned down, now their biggest rival has gone. Unless Toyota spring a surprise in the Ardennes...
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