Apples and oranges.
The Prius was designed and marketed to be the ultimate fuel economy production car, which it is.
The TDI is just an engine option in a brand of cars designed around driving passion, but it just happens to have pretty good fuel economy too! There was no exceptional attention paid to RR or aero with the TDI.
Put a diesel ICE in a Prius-like car and the diesel wins hands down.
BTW, according to Wayne, who's got to try pretty much all hybrids and the Jetta TDI, over 60 mph the TDI starts to pull away.
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