[Bad Moon]

It varies depending on fuel quality. Follow the DIC, but I don't let it get below 10% filter life anymore, after it went into limp mode on US 95 in Nevada. Luckily I re-set the code and made it to my next stop where I bought a filter and put it in myself at the park. I always carry a spare in my tool box.

The reason I say follow the DIC, is because it is the best indicator of how dirty the filter is. Mileage alone is meaningless if you just replaced your filter and then bought a tank of bad gas. I've heard stories of exactly that happening. When it is time to change the filter, do it yourself at least once, in the comfort of your driveway. It's not hard. That way when you have to change it at a rest stop in the middle of nowhere, in the rain, you won't have to learn on the fly. Lots of how-to videos on youtube.