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Originally Posted by MrSelfDestruct
I guess it's convenient, but anyone who can't manually turn on lights shouldn't be driving. DRLs are a drain on the battery, and I read in Car&Driver two years ago that in a 25mpg car, producing that extra electricity is costing you 2-3mpg. When I had a Buick with them, I pulled the fuse after a week and killed them.
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How do you figure that they are a drain on the battery? The sole purpose of the battery is to start the vehicle, and regulate the alternator. As far as the person in C&D, DRL's have too low of a amperage use to cause a 2-3 MPG loss. I would like to see factual evidence of a test done to support their claim. It doesn't make any sense what they are saying.
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Originally Posted by THGL
I hate, hate, HATE DRLs.
DRLs are usually the highbeams so they can be seen better during the day. I understand the want for them (so others can see you better) but what I've noticed is that the sensor doesn't kick on the regular lights at dawn or dusk (when it's just dark enough to make high beams distracting or blinding to oncoming traffic). I think just the regular headlights would be a better idea.
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Your information is slightly skewed. DRLs, while using the highbeam BULB, is NOT full power highbeams. They create a series circuit through BOTH higbeam bulbs. This effectively turns on both bulbs, but at HALF brightness. Considering that the standard lowbeam is only 55 watts, and the standard highbeam is 80 watts, then DRL's run at only 40 watts, which is less than a regular lowbeam.