Fast cars generally use more fuel than slower cars because they have more powerful engines that require more fuel to run. In addition, high-performance driving, such. driving fast, accelerating, and braking hard, consume more fuel. In addition, some performance modifications, such as forced induction, can increase the fuel consumption of the engine. A car that is driven aggressively and at high speed will use more fuel than a car that is driven more moderately, even if both cars have similar engines and power changes.