UK average fuel prices

What’s in Synergy Supreme+ 99 premium petrol from Esso?
Their website says "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". They add "a
lthough 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".
Esso webpage

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Latest average fuel prices across the UK from report the premium for the Super Unleaded E5 grade is 16p so filling up an MGBGTV8 tank with 12 gallons (54 litres) of E5 would cost £86.35 - that's an additional £8.64 on a tank of standard E10 unleaded.

In our NEWS update on 15th September 2021 the petrol prices were then:
Unleaded @ 134.9p per litre
Super Unleaded E5 @ 147.9 p per litre
Increases of 6.67% (E10) & 8.11% (E5)
What is the additional cost of using Super Unleaded E5 grade?
The additional fuel cost of Super Unleaded E5 compared with the now standard E10 in a classic car like an MGBGTV8 at say 29 mpg and say 3,000 miles pa would be £68.41 pa. At 30 mpg and 3,000 miles pa the comparative additional cost would be marginally lower at £66.13 pa.

Benefits of using Super Unleaded petrol with an MGV8
The lower ethanol content in the E5 Super Unleaded fuels helps reduce the damage ethanol can do to parts of the fuel system, particularly damage to rubber fuel hose. The article recently contributed by Barrie Jones illustrated his experience when examining replacement hose he had used only 8 years ago. See his article

E10 on all forecourts from 1st September 2021
From 1st September 2021 all forecourts in the UK have been required to sell new Unleaded grade of petrol as standard labelled E10 on petrol pumps which contains up to 10% bioethanol in each litre from the pump. Super Unleaded is labelled E5 across the UK and that E5 logo indicates it contains up to 5% ethanol and in some cases it has zero ethanol - for the example Esso's Synergy Supreme+ 99 has zero ethanol at many of its forecourts in the UK.