Electric car efficiency is important given the state of energy density and energy storage. Efficiencies are one way to look at performance of electric cars. To do this, specifications from the following pages were collected from published values.
The specs for these cars were then compiled and plotted (below) to show efficiencies of the modern day electric car. There were 41 cars with specs complete enough to plot. The cars are listed below the plot. Names have been left off the graph for space saving reasons.
For this plot, English units have been used, but the graph would look about the same in SI units.
Efficiencies have been estimated/calculated at 80% battery pack discharge. This conflicts somewhat with field measurements in at least one case, but 80% was used to remain consistent. Efficiencies are not published for very many cars, so estimation is required in most cases.
Plot of vehicle weight vs efficiencies in Watt Hr / Mile
You can see that there is a general linear upward trend between vehicle weight and efficiency. Generally you get decreased efficiency (increased WH/Mi) with weight.
However, some of the cars are more efficient than the trend despite their weight: Aptera 2e and Geely EK2 for example. On the other hand, the Buddy Kewet however is a light car with a lower efficiency.
This plot will be refined as real world data is collected.
