Automobiles are highly complex machines with a variety of interdependent systems. As such they require periodic maintenance to perform at their peak efficiency. This periodic maintenance is usually called a tune-up. This is especially important in today’s world where fuel economy and emissions are so important. Depending on the type of vehicle you are driving, the kind of driving you do and the age of your car, the time between tune ups can vary. Knowing when to perform one or take your car to the shop can save you time and money.