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Yeah, it really depends on usage. Mine spends a good portion off-road, and I'm in Australia so it is dustier than most, but I think the message is, check it when you change the oil. If it looks close to what mine looks like, replace it!
It's your truck and your money, but there is a good argument for not replacing air filters "when they look dirty" or on a mileage interval basis. As stated by Filter Minder, "a certain amount of dirt in the air filter actually INCREASES ITS FILTERING EFFICIENCY..." (link below). In other words, an air filter that is somewhat dirty, but not causing a restriction, will actually provide cleaner air to the engine. Another thing to consider is that any time you mess with an air filter, if you are not very careful, you run the risk of not installing it or the housing correctly and getting a perfect seal....if that happens, you'll dust your engine in short order. In the heavy truck industry, I've seen engines dusted due to this very reason. As for me, I'll trust the engineers that spec'd the air filter restriction gauge as the best method for determining when to replace the air filter.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.