1. Most cars actually get worse mileage at higher speeds: Source: https://afdc.energy.gov/data/10312 https://afdc.energy.gov/data/10312 2. Electric cars can go

1. Most cars actually get worse mileage at higher speeds: Source: https://afdc.energy.gov/data/10312 https://afdc.energy.gov/data/10312 2. Electric cars can go MUCH further at slower speeds than at higher speeds. It is something like 25mph that maximizes range, at least with the Model S and Mach E. 3. Speed governors for cars, though probably highly unpopular amongst drivers, would probably save a lot of fuel.