In the past week we have observed the following prices for a litre of 91 — Wellington $2.06; Paraparaumu $1.94; Levin $1.81.

Why does it get cheaper the further north from Wellington you go?

That’s the general area into which Energy Minister Judith Collins said last week there is an investigation underway. The study will focus on fuel company returns and take an in-depth look at the companies’ finances.

Ms Collins said fuel margins had more than doubled over the last five years.

The study would “determine if companies are making super-normal profits or not”. Other financial benchmarks may also be used.

Radio NZ article

In America the Google maps app tells you what pump prices are at each service station; in NZ you need to rely on reports of friends or on social media.