The vocabulary on the two sides of this site is not the same, and the mismatch is where most confusion about heating oil cost starts. What follows is the working set.
Primary sources for this page
- ASTM D3699 standard specification for kerosineThe specification behind the grade names. Paywalled, cited for the definition rather than quoted.
- HMRC Excise Notice 192, registered dealers in controlled oilThe RDCO scheme. It is a statutory approval to deal in rebated oil, it is not published as a searchable consumer register, and it is not a quality or price guarantee.
- Alternative Fuels Data Center, biodiesel blendsEnergy content and blend handling guidance for B5 through B100.
- EIA State Heating Oil and Propane ProgramWeekly residential delivered price of No. 2 heating oil, national and by state. Collected October to March. The survey pauses after the last March print and resumes in October, which is why every federal page shows March data all summer.
- Approved Document J, combustion appliances and fuel storage systemsThe building regulations guidance covering domestic oil tank installation and siting in England.