If you have a current membership with Collingwood, Richmond or Hawthorn AFL Clubs, you can apply for a discount card with United that entitles you to 4cents a litre off.
https://www.unitedpetroleum.com.au/magpies/
https://www.unitedpetroleum.com.au/tigers/
https://www.unitedpetroleum.com.au/hawks/
Certainly not worth it.