Many drivers are concerned that charging their phones in the car could lead to increased fuel consumption. This concern is technically valid, as any electronic device that draws power from the vehicle eventually places some load on the engine. But how significant is this impact on your wallet?
According to a report by Dave Meikleham from July 23, 2026, the short answer is: negligible. While it is true that phone chargers consume fuel, the amount is so minimal that it’s hardly noticeable during daily travel. To grasp this, we need to understand how a car’s electrical system operates.
How Car Electrical Systems Work
When the engine is running, your phone draws electricity from the car’s alternator. The alternator, in turn, takes power from the engine, which consumes fuel to keep running. This process is the same for all electrical components in the vehicle, from turn signals to the entertainment system.
Power Consumption of Phone Chargers
The key factor here is power consumption. A phone charger typically requires about 5-15 watts of power. In comparison, a car's air conditioning system can draw thousands of watts. Even the turn signals consume more electricity than a phone charger. Therefore, the impact of charging a phone on fuel consumption is very minimal.
Fuel Efficiency Impact
To provide a clearer picture, Bloomberg reported (via How-To Geek) that an average car charger might reduce fuel efficiency by about 0.03 miles per gallon (MPG). If your car typically gets 20 MPG, that means with the charger constantly in use, the efficiency might drop to 19.97 MPG. This slight decrease is unlikely to significantly affect your travels. For context, using the car’s air conditioning can increase fuel consumption by up to 10%. The difference between 20 MPG and 19.97 MPG is almost imperceptible, even on long drives.
Concerns About Battery Drain
Another worry is that charging a phone can drain the car’s battery. This assumption is not entirely accurate, especially when the car is running. When the engine is on, the alternator powers the 12V battery, which is then used to charge the phone. The additional electrical load is minimal and will not deplete your car battery.
However, the situation changes when the engine is off. If you charge your phone for an extended period while the engine is not running, the power will be drawn directly from the car battery. While the chances of completely draining the battery are slim, it is still a possibility.
It is advisable to avoid charging your phone in the car when the engine is off, particularly if the vehicle has not been used for a while or if the battery is old. Generally, there is no need to worry excessively about the effects of charging your phone on fuel consumption or battery health. It’s not something that should cause you stress.
Conclusion
In conclusion, charging your phone in the car is not a primary cause of fuel waste. Other factors, such as driving style, engine condition, tire pressure, and air conditioning use, have a far greater impact. So, you can confidently charge your phone while driving without being concerned about straining your budget.
Source: https://telset.id/how-to/benarkah-cas-hp-di-mobil-boros-bensin-ini-fakta-lengkapnya
