How this is built
Methodology
What data Monday Diesel pulls, where it comes from, and how often it refreshes.
What we pull, and from where
Everything on this site comes off the US Energy Information Administration's open-data API. Three series families:
- The weekly retail survey: EIA's on-highway diesel price survey, priced as of Monday and posted Tuesday morning. We pull the complete published set: the US average, the five PADDs, the three East Coast subregions, California, and PADD 5 without California.
- The daily spot series: ULSD at New York Harbor and the US Gulf Coast. EIA quotes these for each business day but releases them in batches several days at a time, so the newest spot date can sit a few days behind the newest retail week.
- The daily crude spot series: Cushing WTI and Europe Brent, from the same EIA route, the upstream layer behind the diesel-versus-crude pages.
How often
The pull runs weekly, timed to EIA's Tuesday-morning survey release and ahead of the Tuesday brief. Each pull covers a trailing window, not just the newest week, so a missed run backfills on the next one. A federal holiday can slip EIA's release by a day; the data carries its own dates, so a slipped release shows up as a later-dated week, not a gap. Every data page carries two dates: "data through" is the newest reading in the data itself, and "page updated" is when the page was last rebuilt.
For how to read the numbers once they are in front of you, see how to read this.
Republishing our charts and statistics
The charts and statistics on Monday Diesel are free to republish. Use them in an article, a report, a class, a presentation, or a post — you do not need to ask us first. We ask one thing in return: credit Monday Diesel with a visible link back to the page you took the figure or chart from, and keep that link live.
Every chart has an Embed chart button with a snippet you can paste straight into a web page. Because it points at the live image, the chart you embed today keeps updating itself as new data lands — you never have to swap in a fresh screenshot. Every data page, guide, and issue has a Cite button that hands you a ready-made citation line, including the date the data runs through. If you are quoting a number, keep that date: it is what tells your reader how current the figure is.