The US06 Supplemental Federal Test Procedure (SFTP) was developed to address the shortcomings with the FTP-75 test cycle in the representation of aggressive, high speed and/or high acceleration driving behavior, rapid speed fluctuations, and driving behavior following startup.
Vehicle speed over the US06 test is shown in the following chart.
Figure 1. SFTP US06 Cycle
The cycle represents an 8.01 mile (12.8 km) route with an average speed of 48.4 miles/h (77.9 km/h), maximum speed 80.3 miles/h (129.2 km/h), and a duration of 596 seconds.
Since model year 2008, the US06 results are also used for the determination of the EPA on-road fuel economy ratings using the EPA 5-cycle method.