You can add fuel subtypes to each type of fuel, to have even more customized and detailed records.
To do this:
Go to
Fuel ➡ Fuel receipts.
Click on the
Settings icon on the top right.
Go to the "Fuel subtypes" tab.
Click the Add subtype button under the fuel type you desire.
Enter a name for that subtype and click the checkmark ✔️.
The fuel subtype will be added and you will be able to see it as an option in the fuel forms when adding a new receipt: