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The AUKEY CC-T7 Car Charger has 2 USB Type-A ports- the orange colored one supports Qualcomm Quick Charge 3.0 port while the green one supports AUKEY's own AiPower charging technology.  The orange Qualcomm Quick Charge 3.0 port have the following power profiles: 6-6.5 volts @ 3 amps, 6.5-9 volts @ 2 amps, 9-12 volts @ 1.5 amps.  The green AiPower port provides 5 volts @ 2.4 amps.

The Xiaomi Mi 5 supports Qualcomm Quick Charge 3.0 over USB Type-C. Let's see how well it works with the orange Qualcomm Quick Charge 3.0 charger port like the AUKEY CC-T7 Car Charger and how that compares with using the green AiPower port.

While charging with the battery at 0% charge, we can observe from the oscilloscope screenshot that voltage is 7V and maximum current is 2.1A. 

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With the battery at 25% charge, we can see from the oscilloscope screenshot that voltage is 7V and maximum current has decreased to 2.2A

When the battery is at 50% charge, we can observe from the oscilloscope screenshot that voltage is 7.1V and maximum current is 2.2A

Here is the oscilloscope screen shot with the battery at 75% charge which shows the voltage as 7.2V and maximum current as 2.1A.

You can see below screenshot that the Mi 5 is drawing less than 1 amp when the battery is fully charged. 

The following graph shows how the Xiaomi Mi 5 draws different current levels at roughly 7 volts as the battery charges from zero to full. Up until 80% charge, the AUKEY CC-T7 Car Charger is providing about 14.7 to 15.6 watts to the Xiaomi Mi 5.

The Xiaomi Mi 5 takes around 1 hour 30 minutes to charge completely while the phone is powered on with the AUKEY CC-T7 Car Charger's Qualcomm Quick charge port. 

  

Now, using the green AiPower port, let's see how the charging behavior changes with the Xiaomi Mi 5.

The following graph shows how the Xiaomi Mi 5 draws different current levels as the battery charges from zero to full.  The AiPower port provides about 9 watts to charge the Xiaomi Mi 5 while the battery is less than 80%, which is a lot less than the 14.7-15.5 watts observed when using the orange Quick Charge port.

With less power provided, the Xiaomi Mi 5 takes around 2 hours to charge completely while the phone is charged with the AiPower adaptive charging port compared to the 1.5 hours observed when charging using the orange Qualcomm Quick Charge port.

  

As expected the orange Qualcomm Quick Charge port charges the Xiaomi Mi 5 much faster when compared to using the green AiPower port of the AUKEY CC-T7 Car Charger.  Of course, if the Qualcomm Quick Charge port is being used to charge another Qualcomm Quick Charge compatible phone, you can still use the other port to charge your Xiaomi Mi 5.