How The US EPA Rates An Electric Car with Monroney stickers

How The US EPA Rates An Electric Car with Monroney stickers

Range is just one of the pieces of information that appears on the Monroney sticker of every new car. That sticker is named for Senator Monroney of Oklahoma, who sponsored legislation in 1958 that required manufacturers to disclose the price of their cars. Since then, the sticker has added lots of other information considered important to shoppers.

So how does the EPA come up with those range numbers for EVs anyway? According to, each car is fully charged then left indoors overnight. The next day, it is placed on a dynamometer, which is sort of a treadmill for cars. Then it is run through a standard set of driving duties that simulate city or highway driving.

The city cycle models a typical rush hour commute with lots of stop and go driving and periods of idling. The highway protocol simulates driving on rural roads and interstate highways without any stops along the way. When the battery in the test car is depleted, it is brought back to a 100% state of charge and the amount of electricity required is carefully measured. Using a formula that equates the energy in one gallon of gasoline to 33,705 kilowatt hours of electricity, the EPA than calculates the MPGe — a measure of how efficient a car is.

At this moment in time, the Hyundai Ioniq battery electric car is the efficiency champion with a rating of 150 MPGe in city driving and 122 MPGe on the highway. The Tesla Model 3 Long Range is next at 136 MPGe city, 123 MPGe highway. For comparison purposes, the Chevy Bolt is rated 128 MPGe city and 11o MPGe highway. The combined city/highway ratings are a weighted average in which the city number counts for 55% and the highway number counts for 45%.

The Monroney sticker for electric cars also lists how many kilowatt-hours of electricity it takes to drive 100 miles. The EPA says that number is actually a more accurate way of comparing electric vehicles one to the other.

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How The EPA Rates An Electric Car | CleanTechnica
Ever wonder what that sticker on the rear window of a new car is and where the information on it comes from? Here's everything you ever wanted to know, and more.

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