Jack Miller held the advantage during the second day of official Moto3 testing at Jerez, with rookie team-mate Karel Hanika completing a Red Bull KTM one-two.

Miller slashed his best lap time by a substantial 0.7s, putting the young Australian under the official pole record and 0.367s clear of Czech Hanika.

"Today was a really good day," said Miller. "We managed to test a lot of parts from KTM and it was a very productive day again. The circuit record is a bonus and also I feel really comfortable as well, so we are very happy with the progress we are making. It just shows that we are getting quicker and quicker, step by step.

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"It's too early to say it if we will improve that lap time tomorrow or not. We also have a limited number of tyres, so it's going to be difficult. If we have another nice day with weather like this, then I think we will have a good chance."

Danny Kent was a mere 0.001s slower than Hanika on the Husqvarna branded KTM, with VR46 KTM team-mates Romano Fenati and Francesco Bagnaia all within 0.396s of Miller.

Gresini KTM's Niccolo Antonelli, the dominant force at the Valencia test, was half-a-second adrift in sixth, with Alex Marquez the leading Honda rider in seventh.

Marquez was an improved 0.601s behind Miller on a day when stand-in Estrella Galicia 0.0 team-mate Fabio Quartararo was a highly impressive 0.687s from the top.

CEV Moto3 champion Quartararo is replacing reigning Moto3 title runner-up Alex Rins, who is sitting out the test following recent wrist surgery.

Efren Vazquez, the quickest Honda on day one, exactly matched the time of eighth fastest Isaac Vinales (Calvo KTM). Kent's team-mate Niklas Ajo claimed the final top ten place - but was less than 0.3s from Hanika.

Testing concludes on Thursday.