Fuel Filter Change Interval

I get about 25K miles out of mine and only change both when I start to loose power going up a long climb. Not sure I'd do this with a CAT that can be hard to restart if you do not have a hand pump to get all the air out. With a Cummins you put the filters on dry and cycle the key (30 seconds on) several time and the electric pump gets all the air out before you try and start.