I'm one of the few who tested this product before.. I tested it on my saga blm in malaysia n avanza in jkt. From the test;

1. Saga blm oto
-aircond feel cooler
- n8 jerking when change gear
- feel a little bit more pick up
- fuel saving? Not feel any difference
However, i feel this product have some good effectto my car

2.Avanza - Jkt -
- aircond feel cooler
- No jerking when change gear
- more pick up
- fuel saving noticeable. But no km/l as jkt always jam. But when use, from office to airport, can get 2 trips. Without mpr, only 11/2 trip..

I'm dont have any connection or sell mpr . Just been asked by a friend to test it.

Hope this helps.