"I had a clear track ahead of me in race two and that makes so much of a difference around here.
"So, five wins and a second place for the series' six races, and all but one pole position, so I've got to be happy with that.
"I missed out on getting pole here by one-tenth of a second.
"This was officially my last race on a 600cc bike. That's the plan anyway.
"If a 600cc ride were to come about, I'd take it, but it's just 1000cc superbikes for me now."
Rees has raced the 600cc bikes for a number of years now, winning the national Supersport title in 2017, and said he has showed he is dominant with a standard motor.
"I have learned a lot from racing in Australia this year and I'll head on now to the superbike nationals and just campaign the CBR1000 and try to win on that."
There was double reason for the Rees family to celebrate on Boxing Day, with patriarch Tony Rees showing even at age 51 that he was far from being a spent force – the Kiwi legend winning the Formula One Superbike class overall at Whanganui.
He is a multi-time national champion, many-time Cemetery Circuit winner and a numerous winner at the similar but now-defunct Battle of the Streets race event in Paeroa.
His pace on Wednesday was enough to earn him another piece of silverware.
Tony Rees finished fourth in the day's first of two F1 races at Whanganui, then he stormed into the lead in race two, winning that by a healthy three seconds from Wellington's Jay Lawrence.
These two results were enough to earn Rees the F1 class win overall at Whanganui and boost him from seventh to fifth in the final series standings.
Visiting British rider Peter Hickman, the 31-year-old 2018 Isle of Man champion, won the event's signature Robert Holden Memorial feature race – which Tony Rees opted to sit out as a headache struck him just before the start.
Tony Rees is a seven-time former winner of the Robert Holden Memorial feature race, his last win coming just two years ago in 2016.
Racing was intense in the various other classes at Whanganui too.
Taumarunui's Leigh Tidman won the Formula Three class at Whanganui and took the series trophy for this division, while Taupiri's Zak Fuller won the Gixxer Cup class.
Paraparaumu's Peter Bogusz topped the Post Classics Pre-89 (senior, over-600cc) class, and Lower Hutt's Dean Bentley finished on top in the Post Classics Pre-89 (junior, under-600cc).
Ngaruawahia's Steve Bridge won the combined senior Bears (non-Japanese bikes) and Formula Sport class, while Te Awamutu's Gary Morgan won the combined junior Bears/Formula Sport class and Tauranga's Duncan Hart claimed Super Motard class win for the series.
International talent also glistened in the sidecars classes, where visiting UK rider John Holden and Tauranga's Robbie Shorter dominating the F1 grade and Tauranga pair Barry Smith and Tracey Bryan took the F2 grade win ahead of visiting British co-riders Gary Bryan and Phil Hyde.