[b][i]Usage Note:[/i][/b] Since the Middle English period many writers have used [i]farther[/i] and [i]further[/i] interchangeably. According to a relatively recent rule, however, [i]farther[/i] should be reserved for physical distance and [i]further[/i] for nonphysical, metaphorical advancement. Thus 74 percent of the Usage Panel prefers [i]farther[/i] in the sentence [i][COLOR=#226699]If you are planning to drive any farther than Ukiah, you'd better carry chains[/color][/i], and 64 percent prefers [i]further[/i] in the sentence [i][COLOR=#226699]We won't be able to answer these questions until we are further along in our research[/color][/i]. In many cases, however, the distinction is not easy to draw. If we speak of [i][COLOR=#226699]a statement that is far from the truth[/color][/i], for example, we should also allow the use of [i]farther[/i] in a sentence such as [i][COLOR=#226699]Nothing could be farther from the truth[/color][/i]. But [i][COLOR=#226699]Nothing could be further from the truth[/color][/i] is so well established as to seem a fixed expression.