I was going to bring this up in the oil check thread but decided to start a new one for what I think is far more critical then checking oil and thats checking your tires air pressure. Its more troublesome to check 4 tires for air but way more important from a safety point. I think low air pressure is a major cause of accidents. I check mine about every 3 or 4 weeks on my car and almost always need a lb or 2 of air. On my Motorcycle Every week I pull into DT and have them check my tires and air. How often do you check your air?