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I am using Honda CD 100 ss 100 cc two wheeler. If I increase the head light bulb watts little bit, will the mileage per liter of fuel reduce? and if so, any relationship?

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Not by any amount you can measure, no. The power consumed by the bulbs are such a small fraction of the total that you would not notice it, unless you are adding multiple spotlights or going all retro-mod, maybe, like this pic from the Telegraph:

enter image description here

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