After last night's blistering performance Millar is confident of making further improvements when he heads across the Tasman for a couple of international meets.
It was a good night for Waikato-Bay of Plenty athletics, with Mariah Ririnui winning the women's 100m title also in a personal best time of 11.88 seconds.
There was arguably more interest in the women's sprint final last night, with Black Sticks star Anita Punt one of the favourites for a national title. One of the speedsters in world hockey, Punt started dabbling in athletics earlier this year after being invited to compete in an exhibition event in Christchurch.
The diminutive striker was unbeaten on the track heading into nationals but was well off the pace last night, coming in fifth after pulling up over the final stages of the race. There was some suggestion Punt was battling injury, but she could not be located after the race.
An emotional Ririnui said she was shocked by the win. It was the 20-year-old's first national title at senior level.
"I was aiming to medal and hopefully do a PB so to win the title is just awesome," she said.
Canterbury's Kelsey Berryman was second in 11.92, while Rochelle Coster of Auckland was third.
London Olympian Sarah Cowley, who has decided this year to drop the heptathlon and focus solely on high jump, had a disappointing meet, finishing third in her event.
Elizabeth Lamb took out the title with a jump of 1.82m, with Portia Bing awarded second place on count back.
The nationals continues over the weekend, with world and Olympic champion Valerie Adams the big drawcard in today's events as she chases her 12th national title in the women's shotput.
Jacko Gill will make his competitive return in the men's shotput tomorrow.