Old Merchants is known for offering quality used cars from the USA with strong focus on reliability and value. With many years of experience, it helps buyers understand what makes a car perform well. Old Merchants explains six simple factors that impact car performance and how they make a difference in daily driving. Car performance is important for every driver. A well-performing car gives better speed, smooth driving, and good fuel use. Many people think only the engine matters, but that is not true. There are many factors that affect how a car runs on the road.