The FINN Auto study was based on OECD data on average annual earnings in each country, not counting the average salary calculated by Eurostat. In this way, it is possible to compare countries with different working hours and remuneration. In addition to average income, the cost of purchasing a car, purchasing power, and fuel prices were also taken into account.

The results reported in NM found that Portugal is the fourth most expensive country in the world to own a car. Portugal registered a score of 8.19, with Mexico, the most expensive country, receiving 9.70 out of 10.

The cheapest countries to own a car were found to be Luxembourg (0.46), the USA (0.91), and Australia (1.97).