Question

which of the following is not a true statement about a poorly - running engine?
it gets its best gas mileage.
it may lose power that is needed for normal driving and emergencies.
it pollutes the air.
the engine could stall while driving and cause a traffic problem.

Explanation:

A poorly - running engine has several negative characteristics. It is less efficient, so it does not get the best gas mileage. A poorly - running engine may lose power (due to issues like incorrect fuel - air mixture, faulty spark plugs etc.), it pollutes more (because of incomplete combustion which is common in a poorly - running engine), and it may stall (due to irregular fuel supply, ignition problems etc.).

Answer:

It gets its best gas mileage.