In the high temperatures under the Andalusian sun, most of the grid was keen to try out the harder front tyre. Marc Marquez was the one to make the most of it, with a hard-hard combination that proved much less successful for Valentino Rossi. The reigning world champion used the hard rubber to post the fastest time of the session, as well as a good pace with high 1:39s and low 1:40s.
Two Yamahas completed the top three, but perhaps the less likely Yamahas in Jonas Folger, who led the session early on, and teammate Johann Zarco, who also showed good race pace, both within two tenths of Marquez.
Another stellar performer was Jorge Lorenzo, the Spaniard building on a good FP3 and finishing fourth while testing different tyre combinations on his Ducati. Cal Crutchlow was the next Honda, in fifth position, while Rossi improved significantly on the medium rear tyre to post a series of low 1:40s and the sixth quickest time.
Andrea Dovizioso is looking more like himself in seventh position and will be expecting to go through Q1 without an issue. Dani Pedrosa had a low-key session after dominating practice all weekend, the Spaniard opting for the same hard front tyre as his Honda colleagues, an unusual occurrence considering his slender frame.
A much improved duo completed the top ten, Pol Espargaro bringing his KTM within six tenths of the leading Honda, and Tito Rabat progressing steadily throughout the weekend to finish ahead of his teammate.
The most frustrated face of FP4 was Maverick Viñales, who couldn’t find his rhythm down in sixteenth position and with a set of 1:41s on his last run.