Looking for a great deal on a weeklong car rental? The trick is to hunt for attractive weekly promo rates and coupons, reserve as far ahead as possible, and track your reservation for price drops. Here's the rundown on how to pay as little as possible on a weekly rental car.

Need a one-way car rental? Picking up and dropping off at different location can make a car rental significantly more expensive due to a drop-off fee imposed by some rental car companies.

Planning to rent a car for a big multi-state road trip of the United States? When choosing a car rental company, the top of your requirements should be unlimited mileage and very few geographic restrictions. That's why Sixt is perhaps the worst car rental company for U.S. road trips.

Want to keep your car rental costs down? Scoring a great deal on a rental car is only half the battle. There are myriad ways to sabotage your sweet deal at the rental car counter.

Flying into a city and need to get downtown? Or staying in a city and need to get to the airport? Consider ditching the taxi or Uber and renting a car instead. Three major rental car firms—Avis, Budget and Alamo—offer a 12-hour one-way airport-to-downtown rental in participating cities starting at $9.99.