Whoopsy:

Better question is, why is the P1 that much slower than the 918, despite the horsepower advantage AND the 'much lighter' weight. Unless of course the weight difference is not that much in reality plus the well know fact that Porsche's horses are stronger than others.

Porsche staked the goal post a long time ago for McLaren and Ferrari to shoot at. Over time Porsche added some side wind, aka system optimization to add to the performance. And now it is official that McLaren has missed the field goal. 

Gearing...