Final answer:
The car dashboard alerts the driver about inefficient driving with a flashing red light and a fuel efficiency gauge.
Step-by-step explanation:
The car dashboard can alert the driver about inefficient driving through various indicators, including a flashing red light and a fuel efficiency gauge. The flashing red light is typically associated with low fuel level, indicating that the driver needs to refuel. This alert ensures that the driver is aware of the fuel situation and can take appropriate action. Additionally, the fuel efficiency gauge provides real-time information about the car's fuel consumption, allowing the driver to monitor their driving habits and make adjustments to drive more efficiently.