Mercedes Mullins
Electric vehicles (EVs) are known to be more cost-effective and environmentally friendly than traditional gas-powered vehicles. The cost of charging an EV battery is calculated by dividing the distance driven by 100, multiplying that figure by the kilowatt-hours used per 100 miles, and then multiplying that number by the price of electricity per kilowatt-hour. The Environmental Protection Agency (EPA) provides an EPA window sticker for electric vehicles, which shows fuel economy as miles-per-gallon-equivalent, or MPGe. This figure is useful for comparing energy consumption and costs. The EPA sticker also includes the kilowatt-hours per 100 miles (kWh/100m), which is a more important measurement for understanding the efficiency of an EV.
| Characteristics | Values |
|---|---|
| EPA calculation for electric vehicles | Miles-per-gallon-equivalent (MPGe) |
| Most important measurement | Kilowatt-hours per 100 miles (kWh/100m) |
| Average cost per kilowatt-hour | $0.14 for electricity |
| Calculation for cost to charge batteries | Distance driven divided by 100, multiplied by kWh used per 100 miles, multiplied by price of electricity per kWh |
| Calculation for cost of gasoline for internal combustion engine (ICE) vehicles | Distance driven / fuel economy x price/gallon |
| Calculation for savings in energy costs | Savings = cost of gasoline – cost to charge EV batteries |
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What You'll Learn
Kilowatt-hours per 100 miles
When it comes to electric cars, the metric used to determine efficiency is 'miles per kWh' (kilowatt-hour). This is similar to the traditional MPG (miles per gallon) measure for petrol or diesel vehicles, which indicates how many miles can be travelled per gallon of fuel.
For electric cars, the miles per kWh metric indicates how far an electric vehicle can travel with one kWh of electricity. For example, if an electric car has a battery size of 50 kWh and an efficiency rating of 3 miles per kWh, it can, on average, travel 150 miles on a fully charged battery (50 kWh x 3 miles per kWh).
If the miles per kWh figure is not readily available, it can be calculated by taking the car's battery range and dividing it by the battery size. As an example, an electric vehicle with a range of 240 miles and a battery capacity of 60 kWh has an efficiency rating of 4 miles per kWh (240 ÷ 60).
Most all-electric cars have an efficiency rating of at least 3 miles per kWh. To put this into perspective, a relatively inefficient electric car offering 2.5 miles per kWh would still be equivalent to 100 MPG in a petrol or diesel car.
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Miles Per Gallon Equivalent (MPGe)
MPGe was introduced in 2010 by the United States Environmental Protection Agency (EPA) to provide a metric for comparing the energy efficiency of alternative fuel vehicles with traditional gas-powered vehicles. The EPA conducted focus groups and found that participants favoured a miles per gallon equivalent as a more familiar and understandable metric compared to kilowatt-hours. The MPGe metric is now required on the labels of all new cars and light-duty trucks sold in the US, providing consumers with information about the fuel economy and environmental impact of the vehicle.
The MPGe rating for a vehicle is determined by its consumption per distance. The EPA uses advanced computer modelling or actual driving cycle tests to convert native units into a gasoline energy equivalent. For electric vehicles, the wall-to-wheel consumption is considered, while for liquid fuel vehicles, the tank-to-wheel consumption is measured. This allows for a comparison of the amount of energy that the owner will likely pay to use for different types of vehicles.
It is important to note that MPGe does not necessarily represent an equivalency in operating costs between alternative fuel vehicles and internal combustion vehicles. The cost of alternative fuels can vary widely, and the MPGe metric only focuses on the energy efficiency aspect. Additionally, the MPGe rating assumes 100% efficiency in the conversion of electrical energy, which may not always be the case in real-world scenarios.
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Cost of charging
The cost of charging an electric vehicle (EV) depends on several factors, including the number of miles driven, the cost of electricity in your area, the efficiency of your EV, and the fuel economy of your internal combustion engine (ICE) vehicle.
Firstly, it is important to note that the cost per kilowatt-hour (kWh) of electricity varies depending on your location. On average, the cost per kWh is $0.14, but home charging tends to be cheaper than public charging. The EPA sticker on your electric vehicle will provide its kWh/100mi energy efficiency number, which can be used to estimate the cost of charging.
To calculate the cost of charging an EV, you can use the following formula: cost = distance driven / 100 * kWh/100mi * price/kWh. This will give you the cost of charging your EV for a certain distance. For example, if you drive 100 miles and your EV has an efficiency of 32 kWh/100mi, the cost would be 100/100 * 32/100 * $0.14/kWh = $4.48.
Additionally, you can estimate the savings in fuel costs by comparing the cost of charging your EV to the cost of gasoline for an ICE vehicle. To calculate the cost of gasoline, you can use the formula: fuel cost = distance driven / fuel economy * price/gallon. By comparing the cost of charging your EV to the cost of gasoline, you can determine the potential savings of switching to an electric vehicle.
Overall, while electric vehicles may have higher upfront costs, they tend to be more cost-effective to operate in the long run due to their lower fuel and maintenance expenses.
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Cost of electricity
The cost of electricity is an important factor when considering the switch to an electric vehicle. The average fuel economy for electric vehicles in the United States is 0.35 kWh per mile. This means that the cost of electricity to run an electric vehicle will depend on how far you drive and the cost of electricity in your region.
The electricity costs for an electric vehicle can be calculated by multiplying the average kWh per mile by the number of miles driven and the local cost of electricity. For example, if you drive 100 miles and your cost of electricity is $0.15 per kWh, then the cost of electricity for that trip would be $5.25 (100 miles x 0.35 kWh/mile x $0.15 per kWh).
The cost of electricity can vary depending on your location and electricity provider. It is important to consider these variables when calculating the overall cost of owning and operating an electric vehicle. Some electricity providers may also offer special rates or plans for electric vehicle owners, so it is worth exploring these options to optimize your charging costs.
In addition to the direct cost of electricity, other financial considerations come into play when choosing an electric vehicle. Electric vehicle owners may be eligible for reduced road taxes, congestion charges, and even reduced parking fees in certain areas. These benefits can further offset the cost of electricity and overall ownership expenses.
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Range
The range of an electric vehicle (EV) is a key consideration when calculating fuel efficiency. Range refers to the distance an EV can travel on a full charge. This is usually displayed on the Environmental Protection Agency (EPA) window sticker as part of the fuel economy rating. The EPA calculates the range of an EV by assuming that, due to various charging options, the typical EV will only ever have 90% of a full charge. This means that the stated range is usually lower than the actual distance the car can travel on a full charge. For example, the Focus EV has a range of 76 miles on its label, but it can actually travel 83 miles on a full charge.
The EPA sticker also displays the kilowatt-hours per 100 miles (kWh/100m) rating, which is a measure of the efficiency of the EV and is the most important operating-cost figure for EV owners. A lower kWh/100m number indicates better efficiency. This figure can be used to estimate the cost of charging the EV.
To calculate the cost of charging an EV, you can use the following formula: cost = distance driven / 100 x kWh/100m x price/kWh. The distance driven can be calculated by subtracting the remaining charge from the initial charge level. The kWh/100m rating can be found on the EPA sticker, and the price per kilowatt-hour (kWh) can vary depending on the geographic location and charging option. Home charging is generally the least expensive option, while public chargers can be more costly.
It is important to note that the range of an EV can vary depending on driving conditions and style. The EPA range test drives the EVs continuously on a combined city-highway cycle until the wheels stop to determine the range. However, in reality, driving habits and conditions can impact the range achieved. Factors such as acceleration, terrain, and temperature can all affect the range of an EV.
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Frequently asked questions
The Environmental Protection Agency (EPA) measures the fuel efficiency of electric vehicles (EVs) in miles per gallon equivalent (MPGe). This is a conversion that allows the power used by an EV to be expressed in a term familiar to most Americans: miles per gallon (mpg). The most important measurement, however, is kilowatt-hours per 100 miles (kWh/100m), which is a measure of the car's efficiency. The lower the kWh/100m number, the better.
The cost of charging an electric car depends on the distance driven, the number of kilowatt-hours used per 100 miles, and the price of electricity per kilowatt-hour. The formula to calculate the cost is: cost = distance driven / 100 x kWh used per 100 miles x price per kWh. On average, the cost per kilowatt-hour (kWh) is $0.14 for electricity, but this varies depending on your location and where you charge your EV. Home charging tends to be the cheapest option.
To calculate fuel savings, you need to know the fuel efficiency of your current internal combustion engine (ICE) vehicle in miles per gallon, as well as the energy efficiency of the electric vehicle you are considering. You can then use the formula: fuel cost = distance driven / fuel economy x price/gallon. Once you know the cost of charging the EV and the cost of fuel for your ICE vehicle, you can calculate the potential savings.
