My main problem is still that camera and head movements are not exactly matched in the car, like there is a latency. It's alright in the menu.
I've tried everything in 1.7: not a performance issue, changed about all the settings back and forth, disabled Motion Smoothing, re-plugged my old Vive.
It's the same in 1.8 with the Index at least. If needed I can plug back my Vive in to try again, but it seems it wasn't worked on.
Platform: Steam
Headset: Index
PC: i5 4590, 8GB RAM, GTX 1070
Deluxe edition
Note: others also reported it with a different hardware or point of view