keeping lights off, how much fuel does it save really

[IamIan]

Originally Posted by winkosmosis

IamIan, standard halogen headlight bulbs are only 55W each

Originally Posted by gascort

New cars are probably less due to LED usage.

Just continue to adjust the general concept for the specific conditions you have.

All else being the same:
~40 MPH + ~40 MPG + ~500 Watt Lights = ~5.7%
~40 MPH + ~40 MPG + ~250 Watt Lights = ~2.8%
~40 MPH + ~40 MPG + ~125 Watt Lights = ~1.4%

~40 MPH + ~20 MPG + ~500 Watt Lights = ~2.8%
~40 MPH + ~20 MPG + ~250 Watt Lights = ~1.4%
~40 MPH + ~20 MPG + ~125 Watt Lights = ~0.75%

~40 MPH + ~80 MPG + ~500 Watt Lights = ~11.4%
~40 MPH + ~80 MPG + ~250 Watt Lights = ~5.7%
~40 MPH + ~80 MPG + ~125 Watt Lights = ~2.8%

~80 MPH + ~40 MPG + ~500 Watt Lights = ~2.8%
~80 MPH + ~40 MPG + ~250 Watt Lights = ~1.4%
~80 MPH + ~40 MPG + ~125 Watt Lights = ~0.75%

~20 MPH + ~40 MPG + ~500 Watt Lights = ~11.4%
~20 MPH + ~40 MPG + ~250 Watt Lights = ~5.7%
~20 MPH + ~40 MPG = ~125 Watt Lights = ~2.8%

etc ... etc...

Faster average speed decreases the impact.
Lower average MPG decreases the impact.
Lower Watts of electrical usage decreases the impact.
Higher ICE average efficiency decreases the impact.
Higher alternator efficiency decreases the impact.
If cycled through the battery the higher the battery cycle efficiency decreases the impact.

[Arragonis]

I don't have DRL's but I do run with lights on all the time - its amazing how it reduces the number of people 'not seeing you' and pulling out.

[dcb]

The other side of that coin is that pedestrians don't have DRLs and get less attention time.

[Thymeclock]

Originally Posted by Arragonis

I don't have DRL's but I do run with lights on all the time - its amazing how it reduces the number of people 'not seeing you' and pulling out.

I grew up in a world where that was considered a legitimate reason for using the HORN.

Yes, I have installed air horns, and they are effective at waking up brain-dead drivers when needed.

[Arragonis]

Originally Posted by dcb

The other side of that coin is that pedestrians don't have DRLs and get less attention time.

Street lighting is much better here than in most countries I have been to including the US, but still those of us with kids do fit them with the equivalents sometimes even in daylight

Originally Posted by Thymeclock

I grew up in a world where that was considered a legitimate reason for using the HORN.

I find my approach is less annoying to others not involved in the situation. I've used my (car) horn probably less than twice a year.

[euromodder]

Originally Posted by Arragonis

Street lighting is much better here than in most countries I have been to including the US, but still those of us with kids do fit them with the equivalents sometimes even in daylight

When we've covered everything in fluo, nothing will stand out anymore.


I've had my DRL (which uses the headlights) deactivated by the dealer.
I switch on the lights if and when needed, as I had been doing the 15 years or so before.

DRL have become mandatory fitment on new EU vehicles this year.
These are now usually lower-power LEDs.

[Thymeclock]

Originally Posted by euromodder

When we've covered everything in fluo, nothing will stand out anymore.


I've had my DRL (which uses the headlights) deactivated by the dealer.
I switch on the lights if and when needed, as I had been doing the 15 years or so before.

DRL have become mandatory fitment on new EU vehicles this year.
These are now usually lower-power LEDs.

How did we get by without DRL's for nearly a century?

DRL's add to the cost of the vehicle. Their imposition certainly benefited bulb manufacturers. I say "imposition" because without providing a switch to turn them off that's what it is - an imposition.

[Arragonis]

I have no problems with DRLs, they seem much better than the alternative which is muppets in heavy rain or even at night operating in "stealth" mode.

Silver Audi, Fog, no lights, 90 mph on the motorway = not clever.

[Thymeclock]

Originally Posted by Arragonis

I have no problems with DRLs, they seem much better than the alternative which is muppets in heavy rain or even at night operating in "stealth" mode.

Silver Audi, Fog, no lights, 90 mph on the motorway = not clever.

The "no lights" in precipitation and "90 mph" parts are already universally illegal. When everything is made "idiot proof" we will be living is a world where no thinking is required. Unfortunately that trend tends to build upon itself and there will little incentive to be anything more than an idiot. When everything is on auto pilot the need for critical thinking is eliminated.

[brucey]

I tested this on my car and saw about 2.5% difference. Enough to make me turn them off during the day. The science equations back up my findings.

http://ecomodder.com/forum/showthrea...hts-15179.html