Question 5450
In a vehicle with a direct-injection engine, when it is idling, fuel consumption is…
- zero.
- higher than in an indirect-injection engine.
- lower than in an indirect-injection engine.
Show answer and explanation
Correct answer: lower than in an indirect-injection engine.
With direct injection, fuel enters the cylinder itself and is used more efficiently. That is why, at idle, a direct-injection engine can use less fuel than a similar indirect-injection engine. Even so, the engine is still turning and burning fuel, so consumption is not zero. In the image, the car is at 0 km/h, and the engine is idling at about 1,000 revolutions per minute.