Types of fuel and octane rating
| Type | Octane rating* | |
| E10 | Ethanol 94 |
Fuel is 10% ethanol and 90% unleaded petrol, octane rating 94 Ethanol is made from fermenting plants, such as wheat and sugar cane |
| U91 | Unleaded 91 | Standard unleaded petrol, octane rating 91 |
| E85 | Ethanol 105 |
Fuel is 70-85% ethanol and 15-30% unleaded petrol, octane rating 105 Only when cars are built or modified for this |
| P95 | Premium 95 | Premium unleaded petrol, octane rating 95 |
| P98 | Premium 98 | Premium unleaded petrol, octane rating 98 |
| DL | Diesel | For diesel engines only, no octane rating |
| PDL | Premium Diesel | Diesel plus additives for cleaning and efficiency, no octane rating |
| B20 | Biodiesel 20 | Fuel is 20% ‘bio’ (often vegetable oil) and 80% diesel, no octane rating |
| LPG | LPG |
Liquid petroleum gas or autogas, octane rating 100+ Only when cars are modified for this |
| CNG | CNG/NGV |
Compressed natural gas, octane rating 130+ Only when cars are modified for this |
| EV | EV charge |
Electric vehicle charging station, no octane rating Only for electric vehicles |
*What is an octane rating?
Octane rating is an index of the fuel’s resistance to burning.
- If it burns too early inside the engine, it causes destructive ‘pinging’.
- Higher octane numbers have more burning resistance than lower octane numbers.
- For example, P98 has more burning resistance than U91.