What is the extra cost of using Esso E5 petrol in an MG V8?

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


Posted: 210804 & Updated: 210808
What is the additional cost of using Esso E5?
From the chart below the additional fuel cost of using Esso E5 (with zero ethanol) compared with E10 in a classic car like an MGBGTV8 at say 29 mpg and say 3,000 miles pa, would be £60 pa. At 30mpg and 3,000 miles pa the comparative additional cost would be marginally lower at £57.40.

E10 from 1st September 2021
From 1st September 2021 all forecourts in the UK will be required to sell new E10 unleaded petrol as standard containing up to 10% bioethanol in each litre from the pump. Currently unleaed across the UK contains 5% ethanol and is labelled E5. The new E10 fuel will be labelled E10 on the petrol pump. More


Chart showing the extra cost with various annual mileages is based on an average fuel consumption of 29mpg