Maximillian Guenther and BMW topped a tight second practice session in Valencia.
The German driver set a 1m26.958s in a session in which the top 13 drivers were only separated by less than three-tenths of a session.
Alex Lynn was second fastest for Mahindra ahead of Mercedes' Nyck de Vries and the DS Techeetah of Antonio Felix Da Costa.
Oliver Rowland set the fifth quickest time for Nissan ahead of Audi’s Rene Rast and Tom Blomqvist in the NIO.
Stoffel Vandoorne topped the times early in the session, a 1m27.419s lap enough to put him 0.386s clear of Jean-Eric Vergne and 0.389s clear of Gunther.
The time wouldn't remain the benchmark for long as lap times tumbled in a relatively clean session.
There was a brief spin for Robin Frijns at Turn 2 early on, but he managed to get going before he could disrupt running.
A number of times were deleted for track limits, with T1 and the final corner before the chicane catching a number of drivers out.
Late improvements from Sebastien Buemi, Andre Lotterer and Norman Nato knocked Vandoorne out of the top 10, but he remained within three tenths of a second of the quickest time.