How the EPA gets there - 2015 Ford Mustang S550 Forum
 
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post #1 of 4 Old 07-22-2013, 12:47 PM Thread Starter
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How the EPA gets there

With all the hubbub lately about falsified mpg claims and lawsuits pertaining to other Ford/Lincoln offerings I thought it would be a good time to check in on how the EPA comes up with the mileage figures we all weigh so heavily into our purchase decisions, have a look:

• In a lab the drive wheels are pulled onto a dyno to simulate driving dynamics.
• Driver runs the car through a standardized driving routine attempting to simulate real world trips.
• A schedule stipulates the speed the car must travel at during every second of testing
• An outlet hose captures exhaust gases and measures them to calculate the amount of fuel consumed.

Things to keep in mind:

• Outlet hose measurement cannot effectively capture mileage estimates for Fuel cell, electric or hybrid vehicles
• No idle time that simulates red light fuel waste
• Vehicles are babied, light acceleration and diminished speeds ( about 50 mph for highway test)
• City test lasts 5 minutes, Highway test lasts 12 minutes
• City test done with cold engines, Highway test done with warm engines

Looking at this list its very easy to see where gaps in mileage claims can come from...
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post #2 of 4 Old 07-22-2013, 04:23 PM
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real world testing is the best it gets when trying to find out how many MPG's a car can really get.
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post #3 of 4 Old 07-04-2015, 02:36 AM
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real world testing is the best
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post #4 of 4 Old 08-15-2016, 07:29 AM
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the car must travel at during every second of testing
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