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Fuel Economy

Fuel Economy Label: Updates

Fuel Economy Labels:
A Reliable Consumer Tool

The fuel economy label provides consumers with reliable and repeatable estimates of real-world fuel economy for national-average drivers and conditions allowing consumers to compare fuel economy across different car models.

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Fuel Economy Labels:
A Reliable Consumer Tool

The fuel economy label provides consumers with reliable and repeatable estimates of real-world fuel economy for national-average drivers and conditions allowing consumers to compare fuel economy across different car models.

EPA requires auto manufacturers to revise MPG (miles per gallon) values on fuel economy labels (window stickers) if relevant information becomes available that show that values are too high. EPA oversees the MPG values on fuel economy labels in a variety of ways including:

  • Conducting independent testing on about 15% of vehicle models each year. This testing is done on pre-production vehicles provided by manufacturers.
  • Testing in-use cars and trucks to confirm the fuel economy labels are accurate for post-production vehicles.
  • Assessing information provided by consumer groups, the auto industry, and fueleconomy.gov to identify models for further testing.

If testing reveals that fuel economy labels are inaccurate, EPA will require manufacturers to update the MPG values to provide consumers with the most accurate information available. This page provides the information on EPA's fuel economy label updates. Updated values are also reflected on fueleconomy.gov.

Mercedes Updates Fuel Economy Values for Two C300 4-Matic Vehicles

During EPA fuel economy audit testing, the Mercedes C300 4-matic was found to have values that differed from those submitted to EPA at the time of certification. With EPA oversight, Mercedes conducted new emissions and fuel economy testing, and EPA conducted its own testing at its National Vehicle and Fuel Emissions Laboratory in Ann Arbor, Michigan. As a result of the testing, EPA is requiring Mercedes to relabel the 2013 and 2014 C300 4-matic models with lower fuel economy values. The specific changes to fuel economy stickers are listed in the table below.

  C300 4-Matic FFV C300 4-Matic PZEV
Model Combined
(mpg)
City
(mpg)
Highway
(mpg)
Combined
(mpg)
City
(mpg)
Highway
(mpg)
Original Values 22 20 27 23 20 29
New Values 22 19 27 22 19 28

Press Release

Ford Updates Fuel Economy Values for Six Vehicle Models

Ford recently alerted EPA that it had identified an error affecting fuel economy values for a number of their vehicles. Specifically, Ford discovered that it underestimated some of the real world factors, including aerodynamics and tire friction that are important inputs into fuel economy testing. EPA worked with Ford on an extensive re-testing program to correct the error, overseeing Ford's fuel economy tests, and also conducted independent testing at EPA's National Vehicle Fuel and Emissions Laboratory in Ann Arbor, Michigan to confirm the results. As a result of this testing, Ford is now relabeling six vehicle models. The specific changes to fuel economy stickers are listed in the table below.

Press Release

    Old Label Values New Label Values
Model (Year) Trimline and transmission Combined (mpg) City (mpg) Highway (mpg) Combined (mpg) City (mpg) Highway (mpg)
Fiesta
(2014)
automatic
32
29
39
31
27
37
manual
31
27
38
31
28
36
SFE automatic
34
30
41
32
28
38
SFE manual
37
32
45
36
31
43
Fusion Hybrid
(2013 and 2014)
 
47
47
47
42
44
41
C-Max Hybrid
(2013 and 2014)
 
43
45
40
40
42
37
Lincoln MKZ Hybrid
(2013 and 2014)
 
45
45
45
38
38
37
Fusion Energi Plug-in Hybrid
(2013 and 2014)
 
43
44
41
38
40
36
C-Max Energi Plug-in Hybrid
(2013 and 2014)
 
43
44
41
38
40
36

Other Updates

 

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