<human>: How can I find out if my car is running smoothly and efficiently?
<bot>: To check the efficiency of your car, you should first make sure that all of its systems are working properly. Check the oil levels and tire pressures to ensure they are correct. Then, take it for a test drive to get an idea of how it handles in different conditions. You may also want to consult a mechanic to have them run tests on the engine and other components to see where improvements can be made.