QuickCharge 2.0 tests

I bought a few QC2.0 chargers for my AT&T G4:

2-pack Samsung Adaptive Fast Charge AC chargers: .walmart.com/ip/45734981
Tronsmart Dual Car charger: .ebay.com/itm/191645992162
Aliexpress knock-off single QC2.0 car charger: .aliexpress.com/item/Qualcomm-Quick-Charge-2-0-Stand-USB-QC2-0-Car-Charger-for-Samsung-Galaxy-S6-HTC/32364542508.html

..... and compared with the performance of the STOCK LG G4 1.8 Amp (non-QC2.0) charger.

[Note: front end of URLs ( h tt p : w w w.....) left off since newbies like me can not post external links]

I charged my G4 with power OFF, and used Battery Monitor Widget
( play.google.com/store/apps/details?id=ccc71.bmw )
to measure before and after % remaining,

I "generally" began the charge cycle when the %remaining was low (3-16%, 11% average)
and charged for about an hour (52 minute average)

For each I repeated the test 2-3 times.

Here are the results:
Stock Charger: 1.033 avg, 1.04 max % per minute
Samsung: 1.249 avg, 1.300 max % per minute
Tronsmart: 1.248 avg, 1.290 max % per minute
AliExpress: 1.221 avg, 1.270 max % per minute

So.... even though QC2.0 CLAIMS to charge up to 75% faster, my results were closer to 25% faster

All the QC2.0 chargers were rather consistent in their performance.

I found ambient temperature was an important factor.
The 1st test with the AliExpress was done in a closed car on a 110F day (without AC on)
I got 0.25%/min - but disqualified this result due to the temp extreme
(All other car charger tests were done with car running while driving with AC on)

I'd be interested in seeing if anyone else can test their chargers similarly and post the results here.