Too many car buyers concentrate on the purchase price of their car, then completely overlook the cost of vehicle financing. A mistake here can cost you thousands of dollars over the years and can even leave you upside down on your vehicle. Getting the right car loan at a good interest rate is the best way to save money. It only takes minutes to learn how to get the best loan, but it's important to consider this step before you speak with a dealer.Remember, when you negotiate with a car salesman, nothing is final until it's written in the contract, which usually happens in the Finance and Insurance room (often called "F&I").