"If ever somebody had a bigger earning season than me I thought it would be Butch or Ricky May because they have both had seasons when they won a lot of big races," said Dunn on being informed of his rare second-placed finish.
"I don't mind being second on that list because obviously this year is the most I have ever won in a New Zealand season and that was after only winning one group one at home.
"So it has been a huge season and to be honest I have probably only driven just over 10 months in it, with a holiday at the start of the season and time away at the Inters in Perth."
If Dunn's calculations are right then he averages over 20 wins a month, boosting his confidence he can break his 228 record next season as well as Butcher's mark.
"You never expect to break a record like Butch's one but to be realistic if I have another season like I just had then I could break it because stakes are going up.
"I'd only need to drive the same amount of winners in similar races next season and I could end up with $2.5 million in stakes."
Butcher is locked in his own personal battle at Alexandra Park tomorrow night, starting the final northern night of the season two wins clear of his son Zac on the track's premiership.
Dunn says he will be back home in plenty of time for the Breeders Crown finals in Victoria on August 27.