If, when driving along, the driver notices that the engine power is lower than normal, what should they do?

Switch to a different fuel.
Have the vehicle checked by a competent person.
Replace the engine oil filter.
Adjust the fuel mixture control mechanism.

Explantion: If the driver notices that the vehicle seems underpowered when driving, this could present a number of problems, e.g. lack of power when overtaking. The driver should have it checked by a competent person as soon as possible as there may be a number of causes, some of which may deteriorate further.

Theory Tester

If, when driving along, the driver notices that the engine power is lower than normal, what should they do?

Legal Matters/Rules of the Road