EV efficiency and MPGe

Living Off the Grid in the City Radio Show. Miles per gallon electric equivalent or MPGe is the EPA-formulated efficiency metric to compare to liquid fuel vehicles. It gives a clear indicator of how much more efficient an electric vehicle is over a liquid or gas operated vehicle such as gasoline or diesel. Here, I provide a list of the most efficient EVs on the market, and they hover around the 120-140 MPGe. An efficient gas vehicle may get you about 35 MPG. So, we’re talking magnitudes more efficient. An electric motor in an EV commonly transforms about 80% of energy into torque, while an efficient gasoline engine normally turns about 40% of energy into torque. Also, the EPA has calculated the efficiency of EVs for the energy used every 100 miles of travel in kilowatt hour KWH. So, the lower KWH per 100 miles; the more efficient the EV. The range is another very important metric in an EV. So, look for all these metrics on the Monroney sticker, or window sticker, of new (and some used) vehicles in the US. And, compare efficiency before buying. Another metric not included in the Monroney sticker is the KWH per kilometer (or per mile), that EVs use. These are normally displayed in the vehicle dashboard as you drive. For example, I achieved an 8.2 km per kilowatt-hour efficiency in my 2023 Nissan Ariya Engage. If I were to use 56 kilowatt-hours from the available 66 kilowatt-hour battery, that would translate to about 459 km range, or about 285 miles! That is “well-beyond” the stated EPA range for that EV; about 347 km or 216 miles.
Hector Vladimir 2015-2024©
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