Submitted: Apr 2, 2008 - Tracking gas prices can feel like a roller coaster ride. They're down a little one month, up the next, before shooting up more than 50 percent in a year. Plus, they're different depending on where you look. Other countries, and even other states and cities, can have very different gas prices from your local Gas-N-Go. To the average person, it probably seems as though there's little rhyme or…