Guides

Worked examples built on the stored PPAC series. Every figure in them is computed from the data and re-checked by a test.

• How to read the PPAC metro petrol and diesel price series

  What a row in the PPAC metro fuel price table means, how the API stores it, and how to average a year of Delhi petrol prices with one request.

  Data · 5 min read

• Petrol and diesel price revisions since 2017

  How often metro petrol and diesel prices changed from 2017 to 2025: revision days per year, the longest flat stretch and the largest Delhi moves.

  Analysis · 5 min read

• Mumbai's petrol price premium over Delhi since 2017

  Compute Mumbai's petrol premium over Delhi in JavaScript: 11.22 rupees in June 2017, a low of 5.05 in 2020 and a high of 15.10 in 2022.

  Tutorial · 4 min read