Jordan King described a "learning experience" as he received his second Formula 1 outing with Manor.
King, Manor's development driver since the start of 2015, made his Formula 1 test bow in Abu Dhabi last year and followed it up with his first taste of the MRT05 in Spain on Wednesday.
King finished at the foot of the times, via an excursion at Turn 7, but was encouraged by his day.
"It was a learning experience, it was good, we made a lot of progress," he said.
"There was a lot learned from both sides, from myself on the driving and team understanding the car more."
On comparisons to last year's Manor, King said: "Where we have improved they’re quite big areas."
"The obvious one is the engine, but things like braking stability is much better, traction's a bit better, the front end is more pointy compared to last year.
"It feels good in high speed corners, it’s clearly a good step forward."
King added that he hopes to conduct further test outings with Manor but commented that, "I’ve got to wait and see what they tell me."
King is competing in the GP2 Series for Racing Engineering and occupies sixth place in the standings.