Warrender knows that experience in all conditions on the course - which has two distinct halves - is a huge asset.
"It is definitely beneficial with this marathon as weather conditions can play havoc in the later part of the course, and also getting over the hilly section of the course in one piece is important.
"I love running this event. It's a great New Zealand event and the crowd support is fantastic all the way around the course. Hopefully it's OK weather. My goal is to win and recover well before heading to Japan."
Warrender will face tough competition from Steven O'Callaghan, who has finished runner-up at the Rotorua Marathon a few times, and Phil Costley, who has previously run a blistering 2:13 marathon.
Costley won the event in 2005 in 2:22.07. Australian David Criniti and O'Callaghan may be the men to stop Warrender going back-to-back.
Meanwhile, in the women's marathon, the field is pretty even, with Shireen Crumpton expected to lead the way ahead of Australian champion Kirsten Molloy and an in-form Lisa Robertson.
"I guess like all runners I'd like to win," said Crumpton. "I have had strong performances in Auckland. I like the undulating nature of the course; it breaks up the monotony of running long distances and gives you something else to focus on."
For the organisers, the course presents its own challenges.
"In terms of planning and implementation, there is unlikely to be a more demanding road course in New Zealand," said course director Chayne Zinsli.
"We traverse quiet urban streets, major arterial routes, a State Highway and the Auckland Harbour Bridge - all within New Zealand's largest city."
But the popularity of the event is undeniable. The full marathon sold out in less than five weeks and, with transfers from the half marathon up to the marathon at more than 3000 entrants, it will be the largest marathon field to assemble in New Zealand since the 1994 Rotorua Marathon.
Course records
Marathon
Men: 2:17.43 Dale Warrender 2006
Women: 2:45.51 Shireen Crumpton 2010
Half marathon
Men: 1:06:19 Matt Smith 2009
Women: 1:13.08 Danielle Trevis 2010 15,500entries
On the course
40
nationalities
45,000
litres of water at the aid stations
130,000
paper cups
13,500
bananas
3500
road cones on the course
750
volunteers