Originally Posted by Brian Abraham
As to the 262, the claim that it did,or may have, has been put to rest as a no. There is a comprehensive post war test report done in the US somewhere on the web.
There's Hans Guido Mutke's story, and there's "circumstantial evidence" in the "Me-262 Pilot's Handbook", which is the report you refer to (has been around for years, I have a facsimile copy somewhere).
See
http://mach1.luftarchiv.de/mach1.htm.
I've seen better write-ups, that's just the first one, with most of the details in one place, that I pulled off Google for this reply.
My own opinion: certainly possible, quite possible, not proven.