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Yep, diesel racing engine corresponds to about 1998 or '99, which was the year that BMW won the Nurburgring 24 with a diesel.
To be honest, other than their current engine, I don't see any of Toyota's racing engines being that efficient, since the were high revving NA V8s without DFI. Granted, about the same can be said for anyone else, since especially at LM in '11 and '13 Audi burned more fuel to make more power, combined with the fact that they were running more downforce and needed that power to maximize top speed.
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