. Exactly that all cars will perform slightly better whatever the car as long as it has EFI, as he says most cars have a knock sensor listening for set, as soon as it picks it up it reduces the timing, 95ron will det before 97ron etc etc. So to a tiny degree it will improve performance as you can run a bigger ignition curve before det. Audi s3 reduces BHP depending on what fuel it has in it, an will measure it through knock sensors, fuel temp sensors an a whole load of other sensors lol