I love that link and post. Nitrogen is a complete ripoff and is just another way for Stealerships and tire shops to rip you off. My buddy works at a dealer and he says they make money hand over fist for this crap and when they run out of nitrogen they just fill the tires with air and add green caps. Check air filter. Check you oil and have it changed. Check your tires and air pressure. Check your brakes. I tell people all the time; "If you cant take care of your car trade it and buy a Honda."
I have a schedule set up on my calender as I forget things pretty easily, so I check oil, air pressure and filters every Sunday.