DAYTIME RUNNING LIGHTS
Slate’s Explainer takes on a recent survey published by GM showing that daytime running lights helped avoid 37,000 accidents since 1995. GM’s methodology sounds reasonably sound.
What’s interesting to me is this tidbit:
[Opponents claim] that GM is merely trying to make a buck by making lights burn out faster and upping fuel consumption (since lights do consume an iota of gas). The carmaker has countered that low-intensity DRLs do not significantly decrease bulb life and that the fuel-consumption hit will amount to less than $10 per year, per vehicle. Multiply that by 200 million vehicles in the United States, though, and it amounts to a healthy chunk of change.
DRLs use gasoline?! I always presumed they ran strictly off the battery which, as I understand it, is kept charged by the alternator. So, does running DRLs make the alternator work harder, or what?