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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.
Don
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