AlmightyBMW estimated that converting everything but your headlights to LEDs would save 160-200w, but then your alternator would be oversized:
http://ecomodder.com/forum/showthrea...tml#post122646
Can anyone review his math and\or tell me how much of a difference that might make for fuel efficiency? DonR said that at idle, turning on his headlights boosted GPH from 0.31 to 0.36, stated that his car used 1.8 GPH at highway speeds, so that was a 2.2% difference, which sounds reasonable.
I just replaced my dome light and have another nineteen bulbs. I like the swap and would like to replace more, but the dome was only important because I accidentally leave it on when the car is parked. Which lights have the largest overall draw? I would think that headlights would have the highest consumption, but LED swaps are illegal, right? Then I would guess tail lights--we try to minimize braking, but if our headlights are on, our tail lights are on, too. Then, when we do brake, we do so earlier and longer than others, right? Wouldn't our tail lights be on the entire time?
Of course, the brake lights are unique, I definitely cannot use the ones that I already have for those. You can swap the turn signals, but what would be the point, and how much do you actually use those, anyway?
Well, my dash uses one #194, so I would need to purchase the #74s for the other four. I should probably do that, I think that the low fuel light is out.
I guess that if you are trying to do everything that you can to make your car more fuel efficient, you do the things that have immeasurably small returns.
I guess the real question is, has Basjoos converted to LEDs?
Aerohead?