Any filter that bypasses at any time is not doing its job. And who can say that there filter is not nearly clogged after just 1,000 miles. The only true way to check is to check flow rate of the filter. Witch can not be done by the naked eye.
Monitoring your fuel pressure is almost as good as flow measurement (as well as - change the filters at 10k, and fill-up at high volume stations).
On trips (where you sometimes can not get picky about fuel stations) I go so far as to carry a jar w/ me so I can put the fuel in a clear container and visually inspect it before filling. I had a bad fuel experience once w/ a 6.9L. I really do not want that w/ this engine.