No need pm la haha I'll write it here.. Well frankly speaking I don't know what type of catalyst the Hercules is. Whether it is an octane booster or just some other catalyst, I'm not sure. So as an ordinary user with an ordinary mindset towards the product, driving an ordinary car doing an ordinary test, it came out nothing special.
I'm not too sure if myvi has self adjusting timing ignition or not...since it has DVVT, Toyota/Daihatsu might included this features as well. Frankly speaking, I don't know if myvi has knock sensor or not wahahaha..still learning.
The test I did isn't a thorough one...just an ordinary test many ordinary consumer would do:
1. Drive to petrol station, switched off engine, open the fuel cap...

2. Inserted one tablet of Hercules, then pumped full tank. (40L) tank. Then reset every readings.
3. Drive as usual...to work, to basketball court, to here and there. Mostly in city.
4. Habis fuel, see what's the reading it gave. That's it.
There were some times when I'm stationary with my car engine on. But even if it helps, it's very very minor which is almost negligible (at least to me). I recorded the readings with the on board meter...14.5km/l. I know the reading is not accurate than calculating the consumption ourselves but the calibration is the same with and without using Hercules so that offset the doubt of the meter.
So all depends on your test

