Understanding Electric Car MPG on Edmunds com

30 Апр 2014 | Author: | Комментарии к записи Understanding Electric Car MPG on Edmunds com отключены
Honda Electric Cars

Decoding Electric Car MPG

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EPA Fuel Economy Label

The economy window sticker on the Ford Focus Electric 105 miles per gallon equivalent in type. This mpg-equivalent figure is how the Environmental Protection (EPA) converts the power by an electric vehicle into a that’s familiar to most mpg. The Focus Electric’s 105 number is ultimately more for comparing energy consumption fuel costs, but we’ll the agency’s electric-car mpg stats and what it means to you and your

The agency’s new mpg sticker for an electric (EV) has four key elements: per 100 miles (kWh/100m); mpg-equivalent annual electricity cost; and range. We’ll tackle below.

Efficiency Rating

to the EPA, when the 2014 Focus Electric is driven on its (city/highway) mpg cycle, it requires 32 of electricity to travel 100 miles Similar to miles per gallon kWh/100m is a measure of the Focus’s and the most important operating-cost for EV owners. Unlike mpg, the the kWh/100m number, the better.

Adapting to this smaller-is-better is likely the roughest math of us will face in relation to

The calculation of energy unit per (instead of miles per unit of is common in Europe, where it is in the metric system as liters per 100 Americans, however, do not generally fuel efficiency with 100-unit yardstick. There are of online tools to convert mpg to per 100 miles. and two easy-to-grasp examples of the of this measure can be seen by the 2013 Toyota Prius and Bugatti Veyron .

With an EPA fuel-efficiency rating of 50 mpg, the burns 2 gallons to travel 100 (2 g/100m). The thirstier Bugatti’s rating means it takes 10 to travel the same distance (10 When converted from mpg to per 100 miles, you can see how the Prius’ lower of 2 g/100m denotes better efficiency than the Bugatti’s 10

Go electric and you’ll also see how 32 represents better fuel than 34 kWh/100m.

Kilowatt-Hours to

So how does the EPA get from 32 kWh/100m to 105 To create the mpg equivalent, the EPA uses an energy standard of 115,000 (British thermal units) per of gasoline. Grossly oversimplified, means that if you ignited 1 gallon of unleaded gasoline, it generate that much

To create the same amount of you would need 33.7 of electricity.

So if the 2014 Ford EV could travel 100 miles on kWh of electricity (the energy of 1 gallon of gasoline), it would an mpg equivalency of 100 MPGe. But the Focus EV requires slightly less the 33.7 kWh to travel 100 miles (in case, 32 kWh), so it received an mpg rating of 105 MPGe.

The EPA label both city and highway as well as the overall average economy. For EVs, which to do better in stop-and-go driving, regenerative braking can help to the battery’s charge, city efficiency is typically better highway. That’s the reverse of gasoline vehicles.

The Focus EV a 110 MPGe rating for city but scores only 99 MPGe on the

What does all this to do with fuel economy? Not

The MPGe rating is really useful for comparing the relative consumption of gasoline (or hybrid) with that of electric The Focus EV uses the energy of 1 gallon of gasoline for each 105 of travel, compared to a hybrid which would use roughly 2 of gasoline for every 100 miles it Far more pertinent for electric car focused on cost is the kilowatt-hours-per-100-miles (kWh/100m), which shows you how the vehicle is at converting electricity miles traveled.

The kWh/100m is the new EV mpg, and from a pocketbook lower is better.

Annual Cost

An EV’s EPA sticker lists an annual electric figure ($600 for the Focus The Edmunds article called The Cost of Powering an Electric Car show you that the cost of (and thus EV fill-ups) significantly around the U.S.

For electric cost, the EPA uses a average of 12.5 cents per and the number can change each It assumes an annual driving of 15,000 miles. If the Focus EV 1 mile on 0.32 kWh (32 kWh/100m), 0.32 kWh by 15,000 and you’ve got kWh.

At 12.5 cents per kilowatt-hour, equals $600.

Also that though the efficiency of the Focus EV is 32 kWh/100m, this mean it will travel 100 on a full charge, only it would take that power to go that far. brings us to range.

Honda Electric Cars


An estimated driving-range number is a key part of the EPA sticker for EVs. In the of the Focus EV, this is about 83 on a full charge of the car’s 23 kWh pack.

The EPA label complicates though, by basing its calculations on the that because of various options, the typical EV will only 90 percent of a full Thus the range stated on the EV’s label is 76 miles.

like mpg, EV range can widely depending on how you drive. For the EPA test, EVs are driven continuously on the city-highway cycle until the stop.

PHEVs Have Label

Plug-in hybrids, combine attributes of the all-electric car and the hybrid, have a more fuel economy label attempts to cope with dual-fuel status.

PHEVs, as plug-ins are often have rechargeable battery of varying size, depending on the weight and the automaker’s determination of how miles of all-electric range the car have. The 2013 Toyota PHEV. for instance, offers 11 miles of all-electric drive and has a 4.4 kWh The 2014 Honda Accord delivers up to 13 miles in all-electric and carries a 6.7 kWh battery.

The 2013 C-Max Energi plug-in is rated at 21 miles of all-electric and has a 7.6 kWh battery.

Labels for PHEVS their all-electric fuel in the MPGe format: The Prius is at 95 MPGe, the Accord at 115 MPGe and the Energi at 100 MPGe. Their economy while operating in hybrid mode (which once the grid-charged battery is is denoted in the traditional city-highway-combined mpg 50 mpg for the Prius plug-in; 46 mpg for the Accord and 43 mpg for the C-Max Energi.

Because of fuel economy on trips require combinations of the all-electric and hybrid modes, the label attempt to give a single economy average for each but it does show total all-electric and gasoline range.

When driving any car that electric drive, whether full-time, as with the Ford EV, or part-time, as with the Honda PHEV, fuel economy vary depending on factors as cargo load, terrain, and how much of a leadfoot you are.

all pretty comfortable with our vehicle’s mpg on gasoline: for the electric-drive of the ride, the number to focus on is the per 100 miles (kWh/100m).

Start your head around a new economy measure where is better.

To find a dealership knows how to treat shoppers please visit Edmunds.com’s Ratings and Reviews .


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