How much fuel is wasted by running a car with headlamps on in broad daylight?
on average around 0.2 l/100 km “A daytime running lamp (DRL, also daylight running lamp or daytime running light) is an automotive lighting (Automobile Safety) device on the front of a roadgoing motor vehicle, installed in pairs, automatically switched on when the vehicle is moving forward, emitting white, yellow, or amber light to increase the conspicuity of the vehicle during daylight conditions. DRLs might have been first seriously proposed in 1961 in the USA, in response to Texas Governor Price Daniels’ drive-safely campaign.” “DRL power consumption varies widely depending on the implementation. Traditional low beam headlights consume up to 180 W – with headlamps and all parking, tail, and marker lights on the overall power consumption for lights is in the range of 150 W to 200 W. Traditional dedicated DRL systems use low-power, high-efficacy light bulbs in the range of 5 W to 21 W – that is 10 W to 42 W for both lights. Current production DRL systems based on LED lights consume 6
