Faster than Honda Civic. That's all we know atm :)
McLaren Senna (P15) lap time at Silverstone GP (post 2011)

2018 McLaren Senna (P15) completed a lap of Silverstone GP (post 2011) in 2 minutes and 9.3 seconds.
Track | Silverstone GP (post 2011) |
Type | flying start |
Vehicle | McLaren Senna (P15) |
Power / weight | 800 ps / 1364 kg |
Driver | Chris Harris |
Time | 2:09.276 |
Average speed | 164 kph (102 mph) |
Submitted | 01.06.2019 by FastestLaps |
Source | BBC Top Gear tv show (United Kingdom) |
Views | 742 |
Reference:
BBC Top Gear - Chris Harris Drives - McLaren Senna vs 650S GT3



Kudason 2y ago
If you infer, you will note that the Senna beats a Ducati GP14 by 10sec on Silverstone. The GP14 achieves a 2.04 on COTA, 13sec faster than a McLaren P1. Looking at the layout of COTA (a lot more corners and heavy breaking), I would expect the margin to the GP14 to be wider... meaning that the gap to the P1 is even more vast. And yet Chris Harris makes it seem like the McLaren Senna serves no purpose whatsover. For a car to blitz the holy trinity (similar priced cars) by such a margin is an exceptional feat. And this is a car that you drive to the track, does not need an instructor nor track-prepping.

FastestLaps 2y ago @Kudason
There is clearly some mishap with MotoGP times as there can't be 18 second difference between 2016 and 2017 unless the 2016 qualifying session was in pouring rain.

Tyrone1 2y ago @Kudason
Whilst 2:09 is certainly a decent drive it is by no means the limit of performance of the car.
The purpose of this test was to show how much faster a Gt3 car is vis a vis the senna. Chris harris doesnt take into account the huge amount of seat time he has in the GT3 car when he has relatively no laptime in a yet to be broken in fully senna.

SpeedKing 2y ago @FastestLaps
The fastest MotoGP lap at Silverstone is 1’59.941” set by Marquez in 2017 during qualifying. The 2018 race was cancelled due to persistent rain.

SpeedKing 2y ago @FastestLaps
Yes you're right it was a rain affected race hence the 18 second lap time difference.