> For private cars, the average utility factor (UF)—the portion of kilometers driven on electric motor versus kilometers driven on combustion engine—is 69% for

> For private cars, the average utility factor (UF)—the portion of kilometers driven on electric motor versus kilometers driven on combustion engine—is 69% for NEDC type approval but only around 37% for real-world driving Not a majority, but 37% of your driving on electric is a significant chunk. Would And to take a Prius Prime for an example, you can still have a very efficient vehicle when you're running in normal hybrid mode: > C/D observed 75-mph highway driving (hybrid mode): 47 mpg / 49 mpg / 47 mpg If you're trying to make the most difference with limited battery production, that's 8.8 kWh of batteries for a Prius Prime. You can make more than 6 of them with the batteries that go into a single "low range" Model 3 (54 kWh). Six cars doing a bit over 1/3 of their miles in electric mode, or one car doing all of its miles in electric mode? That's a relatively short electric range car, if 25 miles isn't doing enough for most people there's probably a good middle ground where you use half the batteries of a long range EV but cover 90% of your milage in EV mode. This is of course ignoring that the Model 3 is a lot more fun to drive than a Prius Prime, but just to make the point about battery usage.