McLaren boss Eric Boullier admits Honda's reliability on the final day of testing in Bahrain was "a bit strange" given its struggles during the opening day and the preceding grand prix weekend.
Boullier dubbed Wednesday, the final day of Bahrain's in-season test, as the team's most successful day of 2017 so far, with Stoffel Vandoorne compiling 81 laps. It came a day after the engine manufacturer hit trouble after just two laps, which followed a miserable Bahrain Grand Prix weekend blighted by MGU-H issues.
Though encouraged by the final day's mileage, Boullier does not understand the reasons behind Honda's sudden turnaround.