I use Peak +98, cheaper then all the rest, by a couple of cents anyway, still get discounts if I shop at IGA. And I get about 420km to a tank around the city. Never had an issue with it. There is NO WAY its worth paying at least 7-10 cents a litre more for Ultimate

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Its just the internet dude, its not real.
F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i