<http://schema.org/about>
"We have said it before, and we will say it again - checking your tire pressure is one of the easiest ways that you can green your driving.  However, even the most prudent of us forgets to pull out the tire gauge every 30 days.  That can, of course,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/cars/new-cars-to-check-tire-pressure-automatically.html>