Quote:
Originally Posted by oil pan 4
Some time ago I figured for every 100 watts of accessory load I could remove (not alternator watts) from my suburban I would see about a 0.1mpg increase.
For a car, you would see about twice that for every 100w removed.
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When I turn the headlights (in round figures let's call that 100W, it has LED's where possible) on in my Jeep at idle, my LPH jumps up by 0.3. Since my average speed is 50km/h that's 0.6l per 100km. That's nearly 1MPG.
In a city driven car like my T5 with an AVG speed of 27km/h, that would be ~1.6MPG per 100W.