It wasn't in full use until very late in the Battle depending on the dates you end it.

If you use 15 September it was never in full use.

If you use December 1940, it might have been in full use and if you use the German dates of May 1941, it was definately in full use.

We are all still waiting for you to name those FC squadrons that were still using 87 octane fuel before the end of September. Can't, then they must have been using 100 octane fuel.

Its no good saying that without something substantial to back it up.

So much has evidence from a myriad of sources has been posted that disagrees with your contention.

Oh god.......and now the inevitable excuse from Crumpp.........

[whiny nasal jobsworth desk jockey voice on]

'But aircraft can only use a specified fuel....it says so in books and manuals'

[stupid voice thing off]

PLaying devils advocate, your evidence for the full use in May 1941 is what?

should really be asking for evidence of it 'not' being in full use before may 1941.

You have been presented with an ENORMOUS amount of evidence to the contrary yet you STILL go on and on and on and on and on and on and on like you are right, even though you have ABSOLUTELY NOTHING to support what you are talking about.

http://i.ytimg.com/vi/_EfW9znJYjw/0.jpg

Nice Seadog. Here's another reference in agreement with the ones you listed:

Fuels and Lubricants Handbook: Technology, Properties, Performance, and Testing edited by George E. Totten, Steven R. Westbrook, Rajesh J. Shah, (ASTM International, 2003)

http://www.wwiiaircraftperformance.o...ndbook_p89.jpg

If just because it gets repeated means it was reality.

The Operationing Notes and consumption reports is much more definative that any post war magazine article written by an amatuer historian.

Operating notes? You mean the ones you claim that state that the Spitfire I had to use 87 octane because that's in the manual you claim dates from July 1940; even though it also mentions the Merlin II which had long been out of production? We have proof that numerous Spitfire squadrons were using 100 octane months before July 1940. The consumption data is also completely consistent with RAF FC, and select BC squadrons using 100 octane.

There is an overwhelming mass of data that all points to RAF FC exclusively using 100 octane fuel during the BofB and absolutely none that contradicts the exclusive use of 100 octane.