From Longman Dictionary of Contemporary Englishby far/far and awayby far/far and awayVERYused to say that something is much better, worse etc than anything else Watching sport was by far the most popular activity on Saturday afternoons. Spring is far and away the best time to visit the islands. → far
Examples from the Corpus
by far/far and away• Coolness is by far and away the most important feature of a car these days. 