Team Estrella Galicia rider Jack Miller headed home from Phillip Island in a positive frame of mind after an extremely successful three-days of testing here last week.

The 22-year-old Australian improved his lap times even further on the final day of the official test to finish ninth on the combined timings for the three days.

It may have been warm and sunny but there was a strong and unpredictable wind which caused some issues especially through turns two and three.

This was a particular problem during Miller's race simulation, which he undertook just before the lunch break, as it was impossible to predict the strength or the direction of the wind, both of which changed with each lap.

Despite the wind he managed to set his fastest time that was just 0.809s off the fastest time of the test set by Maverick Viñales.

"These three days here at Phillip Island have been really positive for us,” Jack said. “For the first time in a long time I feel like I'm in charge of the bike and not the other way round. We came here to confirm what we learnt in Sepang and we've done that, so we know our base set up works at two very different tracks and I'm confident it will be the same in Qatar at the final test.”

“There is still some work to do before we get the season underway next month, but we've done much of the hard work and it's now just a case of refining what we have to find the final few tenths we're missing. Overall I'm pleased with our preparations for the new season and looking forward to the final test in Qatar next month."