MotoGP rookie Stefan Bradl was the only satellite rider present at this week's private Aragon test, also attended by the factory Honda and Yamaha teams.
In-between laps on his usual LCR Honda, the young German was given the try the latest version of the factory RC213V prototype, supplying HRC engineers with feedback for next season.
Bradl's best lap time at the end of the two days was a 1m 48.834s, within half a second of Wednesday pace setter and world championship leader Jorge Lorenzo (Yamaha).
“I am exhausted but very happy,” said Bradl. “We worked a lot in the last two days but we found a new set-up which makes me very positive for the future races.
“We improved in different areas gaining more rear grip and corner speed. I can easily say that this is the most productive test we had so far.
“HRC required me to lap the circuit on the new prototype and I was pleased to give them my impressions of next season's machine”.
Bradl is sixth in the championship and just three points ahead of fellow satellite Honda rider Alvaro Bautista (Gresini), who was not present at the test.