What Rosco is saying is that the majority of the world gets it’s electricity from fossil fuels (mostly natural gas now) and the losses over transmission lines are significant.
Less than 10% of the petrol produced is used to power tankers, trucks, and pipeline equipment to move it around, and they’ve gotten good at preventing it from evaporating during storage and transport, so you’re getting 90% of the energy density out of the fossil fuels you source.
Meanwhile, you would be lucky to retain 70% of the electricity you source (also from fossil fuels) because much of it is lost in transmission and conversion as heat. Ultimately, electric cars being “eco-friendly” is a smokescreen by the fossil fuel industry to keep doing what they’ve been doing for more than a century. They just do it outside of the population centers and away from prying eyes.
Now if you happen to be part of the minuscule percentage of the population that is able to source/afford truly “green” energy from solar, wind, geothermal, or nuclear, then maybe you would be better off using an electric car.