Kam,
the guide is aimed at TU engined drivers, the ecu isnt capable of accepting anything higher that 97RON hence why the premium fuels are not recommended... mainly the price increase over the saving is minimal as the engine cant fully ultise the fuel. which is why i recommend manually adding addtives to the fuel solution.
Yeah there seems to be some small improvements on modern engined cars but even then most have to be mapped to really see the full gains
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