18-12-2021, 09:02 PM
In all probability many Sevens will have run on a petrol/ethanol mix, remember Cleveland Discol which was available up to the 1968, this was a blend of petrol and ethanol, at what concentration is not known various sources say from as low as 5% to as high as 20%. This was developed by Harry Ricardo, National Distillers and Shell oil in 1928, so in all probability a lot of Sevens may well have run on it.