The simple fact is that some engines consume oil, others don't. My truck consumes oil sometimes, and not other times. I have yet to find the rhyme and reason to it.
Ford's official spec for excessive oil consumption is 1 quart in 900 miles. Anything less than that is, in fact, considered normal. If you went through 5 quarts in 5000 miles, it'd still be considered OK by Ford's specs.