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Can be down to the octane rating of the fuel... UK's Normal Unleaded is 95 Ron and Super is 97-99ron and if you have ultra deep pockets you can use 102ron but that's just mad £££££££ At about $22-$25 per Gallon.
It probably means that the ecu is mapped to advance the ignition more in the VXR8 than the GXP
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