For context on oil supply to NZ published by the nz govt, viz the US-Iran war.

The #NZ government has committed to earmarking #oil supply for commercial truck shipping at all costs, which I guess is what diesel is.

This confusing metric is essentially "negative price". So the plummeting "number of cents down" means the price is skyrocketing.

New Zealand, relative to other countries is extremely reliant on trucking and government subsidy of shipping via highway shipping infrastructure.

~ https://www.mbie.govt.nz/building-and-energy/energy-and-natural-resources/energy-statistics-and-modelling/energy-statistics/weekly-fuel-price-monitoring

"
The importer margin is calculated as follows:

Importer margin = Adjusted retail price – Taxes – Importer cost

Where:

Adjusted retail price is the national average advertised retail price for a fuel (the ‘board price’), adjusted to reflect the actual price paid by consumers.
Taxes includes direct taxes and levies and costs paid to the NZ Emissions Trading Scheme (ETS).
Importer cost reflects the cost of purchasing the fuel in Singapore and shipping it to NZ.
"

Weekly fuel price monitoring | Ministry of Business, Innovation & Employment

The Ministry of Business, Innovation and Employment carries out weekly monitoring of importer margins for regular petrol and automotive diesel. This data is updated weekly, using the previous week's data.

@screwlisp Seems a rather idealistic model. Where's the random input based on Trump's latest war?