Fuel economy is a measurement of fuel efficiency, based on how far you can travel with a certain amount of petrol (gasoline). A lower fuel economy means the car will be cheaper to run.
Horsepower is the most common unit for measuring the power of an engine.
Torque is a measurement of an engine’s power, closely related to horsepower. More torque indicates a more powerful vehicle and is also a good indication of its acceleration.
Fuel economy is a measurement of fuel efficiency, based on how far you can travel with a certain amount of petrol (gasoline). A lower fuel economy means the car will be cheaper to run.
An intake valve allows the air/fuel mixture to enter the combustion chamber. An engine with more valves tends to increase performance.
This measurement is the total volume of all the engine's cylinders, also known as the engine displacement. This is one of many aspects of an engine that determine its horsepower, but generally speaking a greater size indicates more power.