I mean, you look at the top end drivers - Hamilton especially, Alonso used to to some extent, Hakkinen back in the day too - they will even sandbag right up to qualifying.
They'll run flat out yes, but they deliberately stay off the kerbs a little, take a slightly slower line on some corners. Hamilton is the biggest current example because he got sick of Rosberg copying so altered and started that, hasn't stopped it since.