It gets even more complicated.
In that article, the vehicles are US spec and will have different engine PCM calibrations than say, Europe, Japan or Singapore, because all those countries have different fuel compositions. Also note that the US tends to discourage used imports.
To illustrate the point, an Audi A3 2.0T will have different calibrated features such as knock, emissions or torque delivery if it is sold in the US vs Europe, vs China. Throw a "general market" country like Trinidad in the mix, unless there is a general ecport PCm calibration, you would need to run on min RON require for euro spec fuel and that would be RON 95. On the fuel cap of some small Euro spec German cars you would find that the actual min RON fuel is 98!
When you import roll on roll off vehicles from other countries such as Japan or Korea you need to investigate what fuel is recommended by the manufactor in that country and use the best quality found here and hope there are suitable calibration spark angle modifiers, that would retard the ignition and adapt this setting if a certain knock intensity is detected.
A New/Used JDM STi or EVO requires 100RON. These cars tend to be recalibrated and homologated when sold, new into Europe to run on a min of 95RON and pass the current Stage 4 emissions and noise limits, but can have slight performance benefit if 97-99RON is used.
The suggestion by the Minister is a very crude test to detect engine det and may have had some value if all petrol cars in Trinidad were" general market" standard vehicles supplied by OEM dealers and the PCM calibration allowed for poor quality fuel. Else you looking at a complicated and expensive knock/fuel study and that may never happen
