Renting a car in Europe can be intimidating, but veteran travelers know it is a great way to beat tour buses to countryside sights and to get into the local culture. Before you go, brush up on your manual transmission (stick shift) skills, since you can pay almost 20 percent more for an automatic in Europe. Book a midsize diesel standard, which will be the most comfortable and will save you money at the pump. International agencies such as Hertz and Avis often have the best rates and selection (as well as reliable toll-free emergency numbers and customer service operators). Among the Euro lines, try Auto Europe or Sixti. Want to pilot a Porsche, Jag, or Mercedes? Try Elite Rent. Before setting off, check the car for scrapes because overseas agencies are stringent about damages. No matter what your marque, a few tips from Avis spokesperson Mariana Field Hoppin: Toss a local newspaper on the dash to deter thieves trolling for tourist targets; carry cash to pay for gas (many stations don't accept American plastic); make sure you know how to put the car in reverse and how to use the stereo before leaving the agency; and buy the collision-damage insurance even if you think your credit card covers it.