New Zealanders had a strong sense of pride. "It's such a long way to come and it's such a small place that if you've got to stay here, you've got to convince yourself it's the best country in the world," Dr Phillips said. "It's a big decision to stay in New Zealand. You're cutting yourself off from the world in some ways."
A bit of Kiwi insecurity would have encouraged New Zealanders to pad up their own numbers.
New Zealand may have been shown to have the most inflated self-esteem, but it was not the worst case of self-deception.
India scored itself more than 30 points higher than its global reputation, while Turkey, China and Chile overestimated by more than 25.
The self-image in Greece was the worst in the world, more than 15 points below its global reputation.
Auckland's reputation, meanwhile, ranked just 35th out of the 100 cities - despite another global index, based on a consultancy's research into quality of living, putting the city in third place earlier this week.
Oliver Freedman, AMR's general manager in Australia, said Auckland was held back by being unfamiliar to many of the people surveyed.
The survey, of 35,000 people in 15 countries for the city reputation index, was taken in April and May.