Is it
the further
you get in your trip, the farther
you get in your book or the other way around? Many writers since the Middle English period have used
farther and
further interchangeably.
A relatively recent rule, however, states that farther should be reserved for physical distance and further for nonphysical, metaphorical advancement. Thus 74 percent of the Usage Panel prefers
farther in the sentence
If you are planning to drive any farther than Ukiah, you’d better carry chains, whereas 64 percent prefers
further in the sentence
We won’t be able to answer these questions until we are further along in our research. In many cases, however, it is hard to see the difference. If we speak of
a statement that is far from the truth, for example, we should also allow the use of
farther in a sentence such as
Nothing could be farther from the truth. But
Nothing could be further from the truth is so common that it has become a fixed expression.