i was first introduced to his report after the belgium 2017 gp. i don't know if you remember that race but since then i became a fan.

Mercedes had worked away all weekend at a little tweak to the ers-K mapping. On a normal lap, the electrical energy boost cuts out some way short of the end of Kemmel straight. Keeping it deployed for the last 10 per cent or so of that straight yields hardly any lap time. As it is limited, it’s far better to save it for use where it will deliver greater lap time gain – like the exit of Pouhon, for example. That’s the conventional way of setting up such a system at Spa, and that’s why Vettel’s engine de-rated towards the end of the straight. But Mercedes had a setting that allowed its drivers to override that cut-out at the crucial moment such as this – and that’s why Hamilton’s extra grunt kept coming as Vettel’s ran out. On such details can races be won.