08-03-2023, 08:48 AM
Hi Graham
Looking at my notes for UK petrol, Prewar grades were about 68,75 or 81 octane. Wartime and post-war 'Pool' petrol was about 72. By 1953 80 and 92 were available.
I think the term 'High Compression' is relative, it's still pretty low by modern standards.
91 octane should work fine and may be marginally cheaper, so worth a try but I doubt if performance is better. No downsides to higher octane as such, but it depends on the makeup of the fuel.
Looking at my notes for UK petrol, Prewar grades were about 68,75 or 81 octane. Wartime and post-war 'Pool' petrol was about 72. By 1953 80 and 92 were available.
I think the term 'High Compression' is relative, it's still pretty low by modern standards.
91 octane should work fine and may be marginally cheaper, so worth a try but I doubt if performance is better. No downsides to higher octane as such, but it depends on the makeup of the fuel.