What you get
Premium petrol has a higher octane number (98 or 100) and an additive package that helps keep injectors and valves clean. Every network has its own formula and brand name.
The extra cost of a fill-up
For a 50-litre tank, the difference to standard petrol is about 28.50 RON per fill-up at today's average prices.
Who should use it
- Cars whose manual asks for 98 octane (many turbo and sports engines).
- Occasionally, to clean the injection system, if the manufacturer allows additives.
- It is no substitute for maintenance: a clogged air filter or worn spark plugs raise consumption more than premium petrol can make up for.