[bongodriver]

To be honest 100 octane never seemed to get an official DTD number (unless you can lay your hands on a source)

But considering 100 octane was in use by civil operators in Britain before 1939...even found an article from 1937 discussing the use of diesel engines to replace 100 octane burning petrol engines, and by 1940 there were already plans on making fuels of more than 100 octane widely available then yes common sense would dictate that by the outbreak of war 87 octane was already relegated to secondary use while being phased out.

heres some stuff I found while researching, just thought some was interesting reading.

http://ehr.oxfordjournals.org/conten...1/394.abstract

http://newsgroups.derkeiler.com/Arch.../msg00226.html