Fuel prices at Costco’s Thurrock forecourt cover regular unleaded, premium unleaded and premium diesel, aimed at drivers who already shop the warehouse club and want a cheaper fill-up than many nearby supermarket stations. Regular unleaded competes with standard E10 petrol elsewhere, while the premium grades target motorists who prefer higher-octane petrol or higher-spec diesel for certain engines and driving patterns.

Do you actually need premium fuel?

Premium unleaded can make sense if your car’s manual recommends higher octane (often turbocharged or performance models), where it may help prevent knocking and maintain intended power. If your car is tuned for regular unleaded, you’re unlikely to feel a meaningful difference day to day. Premium diesel is more about additive packages than raw power; some drivers use it for smoother running, especially on longer motorway trips, but it isn’t a fix for existing DPF or injector issues.

• Members-only: you’ll need an active Costco membership to use the pumps.
• Three grades available: choose based on your handbook, not habit.