How the EPA gets there - 2015 Ford Mustang S550 Forum
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post #1 of 2 Old 07-22-2013, 12:47 PM Thread Starter
Join Date: Jul 2013
Posts: 92
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...
mgt550 is offline  
post #2 of 2 Old 07-22-2013, 04:23 PM
Join Date: May 2013
Posts: 62
real world testing is the best it gets when trying to find out how many MPG's a car can really get.
2tonepony is offline  

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