McLaren-Honda third driver Stoffel Vandoorne reckons the MP4-31 has "improved in every area" since the Bahrain Grand Prix.

Vandoorne was speaking after returning to the cockpit for the first time since his flawless debut in Sakhir, concluding the second and final day of the post-Spanish Grand Prix test second quickest overall.

The reigning GP2 champion did 108 laps in total, as McLaren continued evaluating components, fine-tuning set-up and adding to the data gathered on Tuesday, when Jenson Button was in action.

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"The car felt good straight away today," said Vandoorne. "Of course, I had a few laps of adjusting to the car, but it definitely has progressed since I raced it in Bahrain [and finished tenth]. It's been a positive and productive day.

"Although it's easier to get into the car having experienced a full race weekend, there is always a need to readjust for F1, especially after racing in Super Formula, but I quickly got used to it.

"The car feels better in every area, with downforce feeling much improved compared to Bahrain.

"As a racing driver, you want to spend as much time as possible in the car, but I try and optimise every moment I have, and I feel like I've had the chance to do that today.

"All in all, the progress with the car is good, so I'm happy."