| HCOGAS400050 | Introduction |
| HCOGAS400100 | What do we mean by road fuel gas? |
| HCOGAS400150 | When is the excise duty due? |
| HCOGAS400200 | Which vehicles must always use duty-paid gas? |
| HCOGAS400250 | Notification |
| HCOGAS400300 | Returns and duty payment |
| HCOGAS400350 | Gas measurements |
| HCOGAS400400 | Records |
| HCOGAS400450 | Duty-free/duty-paid storage |
| HCOGAS400500 | Offences and penalties |
| HCOGAS400550 | Appeals |
