What is kWh per 100 Miles?
For conventional vehicles, miles per gallon (mpg) is the gold standard for measuring fuel efficiency. This figure tells us how far a car can travel on a single gallon of gasoline and allows us to make apples-to-apples comparisons between gas-powered vehicles based on that criteria. The higher the mpg number, the more efficient the car. Overall, it is a simple and straightforward way to calculate the cost of driving a gas-powered vehicle.
However, when discussing electric vehicles, measuring and comparing the efficiency between different EVs can be more difficult. To do so in a way that applies equally across all EVs and helps determine the operating costs based on electric charging rates, the EPA expresses energy consumption and efficiency in terms of how many kilowatts of energy per hour (kWh) are needed to run a vehicle for 100 miles.
What is a kWh? It is a measurement of electricity equivalent to the amount of energy expended in one hour by one kilowatt. As such, the kWh/100 miles rating aims to define an EV's efficiency in the same way that an mpg rating applies to conventional vehicles.