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The OALD, for the meaning of further says:
(comparative of far) (especially BrE) at or to a greater distance SYN farther
Is further really used as synonym of farther?
As far as I recall, there is a slightly different meaning between those words. I don't recall that exactly, but I think I was taught that further is used figuratively, such as in "I cannot go any further into this discussion."
That's the distinction I draw in my own use; but I don't think the distinction is observed widely enough to say it's the distinction. – StoneyB on hiatus – 2013-04-17T14:10:29.390
3That is what I was taught as well. "Farther" should always be used for literal distance, while "further" is used for everything else. English being what it is, the line is blurred. – Jonathan Garber – 2013-04-17T15:52:11.547