order best to worst petrol IMHO
initially was
BP Ultimate>Mobil Synergy 8000 > Caltex Vortex 98 > Shell Vpower Racing 98
now
Mobil Synergy 8000> BP Ultimate> Caltex Vortex 98 > Shell Vpower Racing 98
2003 - 2006 -- no mods done shell did (400-500km), caltex (500-550km), mobil(550-650km), BP(650-750km)
NOTE: This is just a range of mileage that i have noticed when i drove the car as a daily driver with a couple of thrashings here and there.
2007 - 5zigen catback single exhaust(2.25" inlet diameter pipe expands to 2.5" throughout. w/ AEM SRI only use BP and Mobile (650km)
2008 - single catback, hi flow cat,sri, pulley kit, dc headers(4-2-1 single flex pipe at before the cat), etd, 100mm air feed pipe (steadied at doing 600-650km interval)
Hope this helps a little.
Daz
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