UK Driving Theory Practice Exam

What do loose filler caps do?

Increase fuel efficiency Waste fuel Improve car aerodynamics Reduce car's weight

Correct Answer:

Waste fuel

Explanation:

Loose filler caps can lead to fuel evaporation and leaks, resulting in wasted fuel. This can also be potentially dangerous if the fuel leaks onto hot engine components and cause a fire. While properly closed filler caps may not directly increase fuel efficiency, it does prevent unnecessary fuel waste. Loose filler caps do not have any impact on car aerodynamics or weight.

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