As a rookie to MotoGP next season, Moto3 runner-up Miller was entitled to the extra test days to ensure a smooth transition to the premier class.
The Australian, 19, further explored the Open electronics package on the RC213V-RS, and also tested his fitness with a longer run.
“In general I was really happy with how the bike went,” said Miller, whose only off-track excursion was a small low-side on the final morning.
“We made more improvements and every time I get on it I feel more and more comfortable, and that means I’m getting faster and faster.
“I can’t thank the CWM LCR Honda team enough for their hard work, and Honda too for their support, they are all teaching me really well how to ride in MotoGP.”
Miller will now travel to Barcelona for an operation to remove four loose screws from an old right collarbone injury, before resuming an intense training programme.
“I’m looking forward to the off-season now, and I’ll be training hard and getting my body in the physical condition needed for MotoGP,” Miller explained.
“We managed a long run today and whilst it was really hard, my body stood up to it, so I look forward to coming back even stronger in February.” (GPUdate)