Far在这里不是常说的“远”的意思,far本身也是一个程度副词。
程度 degree
非常;很大程度上;远远;大大
very much; to a great degreeThat's a far better idea. 那个主意好得多。
There are far more opportunities for young people than there used to be. 现在年轻人的机会比过去多得多。
It had been a success far beyond their expectations. 成功之大远远超过他们的预期。
He's fallen far behind in his work. 他的工作大大落后了。
She always gives us far too much homework. 她总是让我们做多得不得了的家庭作业。
摘自牛津词典
所以句子中far修饰away,表示很——远离;而单独的away from就是远离。