Trystan Casey
Electric miles per gallon, or MPGe, is a measure of the average distance travelled per unit of energy consumed. It is used by the United States Environmental Protection Agency (EPA) to compare the energy consumption of electric vehicles with that of conventional internal combustion vehicles, which are rated in miles per US gallon. The unit of energy consumed is deemed to be 33.7 kilowatt-hours, equivalent to the energy in a gallon of gasoline. MPGe is a useful metric for comparing the relative energy consumption of electric and gasoline-powered cars, and for making more informed decisions when considering an energy-efficient vehicle.
Electric Miles Per Gallon (MPGe)
| Characteristics | Values |
|---|---|
| What is MPGe? | A unit of measurement for an electric car's energy consumption level. |
| How is it calculated? | Miles driven divided by gallons used = mpg. |
| What is the unit of energy consumed? | 33.7 kilowatt-hours (kWh) |
| How is it useful? | It helps compare the energy consumption of electric vehicles with gas-powered vehicles. |
| What does a good MPGe rating indicate? | A good MPGe rating indicates that an electric vehicle makes efficient use of its electrical power. |
| What is the drawback? | MPGe does not offer a direct and accurate cost comparison as mileage results will vary due to several factors. |
| What is the annual fuel cost estimated on? | Annual driving range of 15,000 miles and 12.5 cents per kWh electricity cost. |
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What You'll Learn
Miles per gallon equivalent (MPGe)
MPGe is calculated by determining the vehicle's consumption per distance. The EPA uses advanced computer modelling or an actual driving cycle to convert native units into a gasoline energy equivalent. The formula for MPGe is 33.7 kilowatt-hours (kWh) of electricity = one gallon of gas. A car that uses 33.7 kWh of electricity to travel 100 miles rates 100 MPGe.
MPGe is an average mileage comparison – it measures how many miles a vehicle can travel per gallon of gasoline (MPG) or how many miles an EV can travel on the equivalent amount of electrical energy (MPGe). The energy contained in one gallon of gas is equivalent to 33.7 kWh of electricity. So, if an electric vehicle can travel 100 miles on 33.7 kWh of electricity, it would be rated with an MPG equivalency of 100 MPGe.
MPGe does not necessarily represent an equivalency in the operating costs between alternative fuel vehicles and the MPG rating of internal combustion engine vehicles. This is because there is a wide variation in costs for fuel sources regionally, and the EPA assumes prices that represent an average for the nation.
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How MPGe compares to MPG
MPGe, or "miles per gallon equivalent", is a unit of measurement for an electric car's energy consumption level. It is used to compare with gas-powered vehicles' fuel consumption. A good MPGe rating indicates that an EV makes efficient use of its electrical power. The higher the MPGe rating, the more efficient the vehicle, and the lower the energy costs to operate the vehicle. MPGe is especially useful for comparing energy consumption for electric vehicles, as they do not always need gasoline to operate.
The Environmental Protection Agency (EPA) uses an established energy standard of 115,000 British thermal units (BTUs) per gallon of gasoline. This means that if you ignited 1 US gallon of unleaded gasoline, it would generate that much heat. To create the same amount of heat, 33.7 kilowatt-hours (kWh) of electricity would be required. This is why 33.7 kWh is considered to be equal to 1 gallon of gasoline. So, if an electric vehicle can travel 100 miles on 33.7 kWh of electricity, it would be rated at 100 MPGe.
MPGe is not a direct comparison to MPG. However, it enables drivers to make a more informed decision when considering an energy-efficient vehicle. Plug-in hybrid electric vehicles (PHEVs) may have both an MPG and MPGe, since they run on both gasoline and electric energy. The MPG for a PHEV denotes gasoline used when the battery is out of charge, and the MPGe refers to an all-electric scenario.
It is important to note that, just like MPG, MPGe is only a useful way to compare vehicles and is not indicative of actual energy consumption for an individual driver. Cargo load, terrain, climate, and driving style all play a role in determining your exact MPGe. Additionally, MPGe does not offer a direct and accurate cost comparison, as mileage results will vary due to many factors, regardless of the type of fuel the vehicle uses.
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Calculating MPGe
MPGe, or "miles per gallon equivalent", is a unit of measurement for an electric car's energy consumption level. It allows for a comparison of the efficiency of different kinds of alternative-fuel vehicles, including plug-in hybrids and electric cars, with gasoline-powered vehicles. The formula for MPGe is calculated as 33.7 kilowatt-hours (kWh) of electricity being equal to one gallon of gas. A car that uses 33.7 kWh of electricity to travel 100 miles rates 100 MPGe.
The Environmental Protection Agency (EPA) established MPGe as an energy efficiency metric in 2010. The EPA uses a formula to calculate the precise amount of electric energy that is equal to the energy in one gallon of gasoline. The vehicle's consumption of energy per distance, whether gasoline, electric, or a mix of both, can then be used to calculate its MPGe.
For plug-in hybrids, MPGe is a mix of the liquid fuel's tank-to-wheel energy use and how efficiently it uses battery power. For battery-powered cars, the distance travelled per unit of energy directly determines its MPGe rating.
It is important to note that MPGe does not necessarily provide a good comparison of operating costs. While it is a useful metric for comparing the efficiency of different vehicles, the price of electricity can vary widely, and MPGe does not account for the energy consumption upstream, such as the energy required to generate the electricity.
When comparing electric vehicles, it is recommended to consider both MPGe and range. A more efficient car will cost less to recharge, but it is also important to ensure it has a sufficient range to meet your needs.
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MPGe and fuel costs
MPGe, or Miles Per Gallon Equivalent, is a measure of the average distance travelled per unit of energy consumed. It is used by the United States Environmental Protection Agency (EPA) to compare the energy consumption of alternative fuel vehicles, plug-in electric vehicles, and other advanced technology vehicles with the energy consumption of conventional internal combustion vehicles rated in miles per US gallon.
MPGe is the standard metric set by the EPA for fuel efficiency for vehicles that run on alternative energy sources, like electricity. The EPA devised MPGe in the early 2000s, calculating that 33.7 kilowatt-hours (kWh) of electricity was comparable to a gallon of gasoline fuel in terms of its energy content. This is the standard used to calculate the MPGe rating displayed on the EPA fuel efficiency label of every new electric vehicle.
MPGe does not offer a direct and accurate cost comparison, as mileage results will vary due to numerous factors, regardless of the type of fuel the vehicle uses. However, it is still an important way to compare how efficient an electric vehicle is because it is linked directly to how much it costs to charge the vehicle and how much power the EV needs to draw from the grid to charge its battery.
The cost benefits of electric vehicles extend beyond just the cost of fuel. EVs are more efficient than gas-powered vehicles, as they have fewer moving parts, which results in lower maintenance costs. Coupled with tax incentives, the long-term financial advantages of electric vehicles become even more significant.
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MPGe and electric vehicles
The United States Environmental Protection Agency (EPA) uses MPGe, or "miles per gallon equivalent", to compare the energy consumption of electric vehicles with that of conventional internal combustion vehicles. The unit of energy consumed is 33.7 kilowatt-hours, which is equivalent to the energy in a gallon of gasoline. The MPGe rating only considers the energy consumption for which the owner pays, i.e. the energy used to charge the battery. It does not account for the energy consumption upstream, such as the energy required to generate the electricity or transport the fuel.
MPGe is an important metric for consumers as it helps them gauge the relative efficiency of electric vehicles versus cars with combustion engines. A higher MPGe indicates a higher energy efficiency rating, which means lower electricity costs per mile. However, MPGe does not necessarily represent an equivalency in operating costs between electric vehicles and internal combustion engine vehicles due to the wide variation in costs for fuel sources regionally.
MPGe is displayed on the EPA fuel efficiency label of every new electric vehicle, along with information about fuel efficiency, fuel costs, and greenhouse gas and smog ratings. Plug-in hybrid electric vehicles (PHEVs) may have both an MPG and MPGe, as they run on both gasoline and electric energy. The MPG for a PHEV denotes gasoline used when the battery is out of charge, and the MPGe refers to an all-electric scenario.
The MPGe rating is independent of range and battery life, so it is important to examine a vehicle's fuel efficiency. For example, a gas-powered car earning 35 miles per gallon is considered great, but EVs can easily get 100 MPGe. The efficiency of an electric vehicle can be improved by using the economy mode, planning ahead to pre-heat or pre-cool the car while it is still plugged in, avoiding hard braking, following the speed limit, removing excess weight, and properly inflating the tires.
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Frequently asked questions
Electric miles per gallon, or MPGe, is a way to compare vehicle efficiency across models with differing fuel sources, such as EVs versus gas-powered cars or plug-in hybrids. MPGe is a metric intended to make it easier to compare alternative-fuel cars' efficiency with that of purely gas-powered vehicles.
The U.S. government's conversion for this equivalence says that the amount of energy in a gallon of gas is equal to 33.7 kWh. So, if an electric vehicle can travel 100 miles on 33.7 kWh of electricity, it would be rated at 100 MPGe.
MPGe is a standard metric set by the U.S. Environmental Protection Agency (EPA) for fuel efficiency for vehicles that run on alternative energy sources, like electricity. It enables drivers to make a more informed decision when contemplating an energy-efficient vehicle.
