All regular petrol is now E10
From the 1st September the government have mandated that all regular grade unleaded will contain 10% ethanol. This means fewer emissions, which is better for the environment. Synergy Unleaded with E10 will be available at all sites in the UK.
Tell me more about E10
What’s in our Synergy regular petrol
Our fuel engineers spend hours and hours testing different ingredients and formulas, because they know the smallest change can make a difference. Like the molecules in our regular Synergy petrol that have been specially designed to help clean vital parts of your engine (like your car’s intake valves) and help look after your engine. You may have heard that nasty engine deposits can build up in your engine over time which prevent your car from performing at its best and can reduce your fuel economy.*
What’s in our Synergy Supreme+ 99 premium petrol
Our Synergy Supreme+ 99 petrol has more cleaning power than our regular petrol – and includes molecules whose job it is to reduce the friction in your engine helping the moving parts work more efficiently.*
Although our pumps have E5 labels on them, our Synergy Supreme+ 99 is actually ethanol free (except, due to technical supply reasons, in Devon, Cornwall, North Wales, North England and Scotland). Legislation requires us to place these E5 labels on pumps that dispense unleaded petrol with ‘up to 5% ethanol’, including those that contain no ethanol, which is why we display them on our Synergy Supreme+ 99 pumps.
There’s currently no requirement for renewable fuel, like ethanol, to be present in super unleaded petrol although this could change in the future, in which case we would comply with any new legislation.
What’s the difference between regular and premium petrol?
Our Synergy Supreme+ 99 Unleaded is our highest octane fuel. Higher octane can help to reduce knocking-related performance losses in modern cars.
Our Synergy Supreme+ 99 Unleaded fuel also has extra additives which can benefit all petrol cars, even older ones.* Synergy Supreme+ 99 Unleaded fuel has double the amount of detergent additive compared to our regular petrol, which helps give your engine a deeper clean. The cleaner your engine, the better it can perform and the more fuel efficient it is.
Synergy Supreme+ 99 Unleaded fuel also contains molecules that help to reduce friction in your engine helping the moving parts work more efficiently.*
Synergy Supreme+ 99 is up to 5% ethanol, whereas our regular Synergy unleaded contains 10% ethanol.
What is octane?
The octane rating of petrol is a measure of its resistance to knock, with higher octanes more resistant to knock. Petrol engines work by compressing air and fuel, then igniting the mixture with a spark. Certain engine conditions can cause all or part of the mixture to ignite on its own without the spark, creating what’s called “knock” in your engine. Fuels can be blended to meet different octane ratings at the refinery or fuel terminal.
The majority of today’s petrol vehicles are designed to run on regular octane fuel (95). However, using higher octane fuel than the minimum required can benefit fuel economy, power and acceleration even in vehicles calling for regular fuel. Engine design features like higher compression ratios and forced air induction (e.g. turbochargers or superchargers) can make engines more responsive to octane. The benefits achievable with higher octane depend not only on hardware design but also on the car’s calibration and the user’s driving style.
Here are some handy driving tips
Keep your car well serviced, and make sure you check the oil levels regularly to help keep the engine happy.
Make sure you check your tyre pressure at least once a month and before you set off on a long journey. Under-inflated tyres can increase your fuel consumption by up to 4 percent. **
If driving at 60 miles per hour or more, keep the windows up. Open windows create a lot of aerodynamic drag, which can add to your fuel usage when driving at high speeds. Also, remove the roof rack if you’re not using it, for up to 10 percent savings on fuel. ***
Don’t let your car idle for prolonged periods of time. If you get stuck in a traffic jam, consider switching off your engine, provided it is safe to do so.
Our Synergy diesels
Find out more about the Synergy technology in our diesels, and the differences between our regular and premium products.
* Esso Synergy Supreme+ 99 Unleaded Petrol claims based on (1) internal or third party vehicle engine testing; and /or (2) government publications; and/or (3) industry or scientific literature. Benefits may vary depending on factors such as engine type, driving style and fuel previously used. Esso Synergy Supreme+ 99 Unleaded Petrol has a double additive treat rate, compared to Esso Synergy Unleaded Petrol. Esso Synergy Supreme+ 99 Unleaded contains a friction modifier. Esso Synergy Supreme+ 99 Unleaded is available at selected Esso branded service stations only.
**International Energy Agency