I reckon the Senna lap of 1:40.79 at Hockenheim is dodgy as fcuk. When one compares Gebhardt's lap to Duncan Tappy's the speed comparisons at 4 different points are way too big. Here are the 4 examples in km/h at the same point on the track with both cars using GPS speedo figures.
Tappy is generally faster than Gebhardt and there's no way he's gonna be 3.6 sec slower that Gebhardt in the same car at Hockenheim. Gebhardt's Senna was definitely producing more power than Tappy's. More dodgy bullshit from Sport Auto