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Old 08-21-2009, 11:50 AM   #4 (permalink)
Master EcoModder
Join Date: Mar 2009
Location: Northeast Ohio
Posts: 269

The Wife's Hot Rod - '09 Pontiac G8 GT
Last 3: 23.22 mpg (US)

Big Outback - '13 Subaru Outback 2.5i

Little Outback - '02 Subaru Impreza Outback Sport
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According to my scanguage, When I'm idling with a hot engine & I turn on my headlights fuel consumption goes from .31gph to .36gph. 14% at idle. Going down the road at 1.8 gph that's 2.2%. Yes there will be a difference. Will you ever make up the cost, maybe. If they are common bulbs you may be able to transfer them to another vehicle.

I would start by replacing the bulbs that are on the most, especially if you have daytime running lights.

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