The question of whether powering a mobile device via a vehicle’s auxiliary power outlet impacts fuel consumption is a common inquiry. Fundamentally, the energy utilized to charge the phone must originate from the vehicle’s electrical system, which is ultimately powered by the engine. Therefore, there is a relationship, albeit typically minimal, between the two.
The effect on fuel efficiency is usually negligible in modern vehicles due to the efficiency of alternators and the relatively low power draw of most mobile devices. Factors influencing the degree of impact include the car’s age, engine size, and overall electrical load. Older vehicles with less efficient charging systems may exhibit a slightly more noticeable difference.