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Old 09-04-2008, 09:08 AM   #4 (permalink)
Gregte
EcoModding Apprentice
 
Join Date: May 2008
Location: South Dakota
Posts: 117

GMC Sonoma - '94 GMC Sonoma
90 day: 36.97 mpg (US)
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Quote:
Originally Posted by smwoodruff0908 View Post
...
5) What kind of improvement could I expect from swapping all my lights to LEDs? I do quite a bit of night driving (I love the open roads ) but is it really going to make a difference if I change all my lights?...
I doubt that you could save as much as 10% of one horsepower by changing everything, excluding headlamps, to LEDs. One HP is about 746 watts. You can determine the actual wattage of all the bulbs you have by multiplying volts times amps. The current draw values can be looked up for the bulbs.

If you gained a 1/10 HP advantage then that might calculate to about a 1% increase in FE at normal highway cruising, assuming your cruising power requirement is around 10 HP. So if you get, say, 35 MPG this would be an increase of 0.35 MPG.
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