car charger

I feel someday more gas cars may come with a electric charger cable which is use to charge a car's battery which electricity is used to power electric parts like lights, the air conditioner, Window wipers, power windows, stereo system, alarm, touchscreen tablet, self-driving computer systems...

If you want to save as much gas and money as possible, it may not be worth it to charge your phone/tablet by plugging it into a car's USB port because the car would use slightly more gas when more electronic devices like chargers, air conditioner, radio, touchscreens, and lights are powered on...