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Math already done by others, but my first impression would be yes and no. Yes, because any load requires energy from somewhere; No, because electrical loads less than a major sound system are so insignificant you will never notice outside of a lab. Driving up one decent hill will consume more gasoline than the added load of your laptop over the entire tank, ...

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This is really just a footnote to alemi's answer. The electricity for your car is supplied by the alternator, and the torque required to turn the alternator depends on the current it's supplying. As you draw more current more torque is required to rotate the alternator and the car has to use more power to do it. So yes, plugging in your laptop will increase ...

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$$110 \text{ hp} = 82 \text{ kW}$$ This is 1000x what the laptop draws. You won't notice. To put that change in perspective, you would see a similar increase in the power (85 W) used by the car if your speed changed from 65.00 mph to 65.02 mph, since $P \propto v^3$ (at high speed, the power goes as the velocity cubed) as per this answer, so \$ ...

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