This week on Car Talk, how well do you know your Commandments? Tom and Ray take the Vatican's new "10 Commandments of the Road" and add a few from their own experience. #26: Thou Shalt Not Take Thy Rental Car to Mexico? We then explore a possible loose nut behind the wheel in California, and the merging of kitchen implements with automotive servicing in Baton Rouge (turkey baster to change power steering fluid, anyone?) Why on earth would anyone pay 20 bucks for gas, but not fill up? The answer to week's puzzler is hidden in plain sight. In our second half, find out why Josh in San Francisco ought to stick to summer driving or ante up a few thousand bucks, how Danielle in Louisville can save herself from a set of dentures, and whether Katie's Odyssey is doomed to a life as Casa de Jelly Belly. Our new Puzzler comes from the world of words, then Tom and Ray attempt to help Vallen deal with an ornery set of electric mirrors, while sharing their favorite tip for avoiding the dreaded blind spot. Finally, how's your fluid physics? Is it true that if you get gas early in the morning or late at night, you'll get more for your money? Find out who gets the Mojito, as Tom and Ray settle a bet between Steve and his pal. All that and more, this week on Car Talk.