How often should I tune up my car?

Performance tuning focusses on the tuning of an engine for motor sport, although many cars built by hobbyists never compete but are rather built for display at motor shows or the simple pleasure of owning and driving such a car. In this context (and depending on the particular event), the power output, torque and responsiveness of the engine are of premium importance, but reliability and economy are also relevant. To win, a car must complete the event. This means the engine must be strong enough to do so, often far stronger than the production design on which it is based, and also that the vehicle must carry sufficient fuel. The weight of this fuel will affect the overall performance of the car, so fuel economy is a competitive advantage.