I wouldnt use Caltex Premium, Caltex is known to be a very dirty fuel. I'd try and get some BP Ultimate, or Shell V-power. A mate of mine who is a mechanic races cars and found he got more power and economy out of the BP Ultimate followed closely by Shell V-power.
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2006 WQ Fiesta Zetec Sea Grey
Interior:- MOMO Blue Leather Gear Knob, Window tint, Scuff Plates, ST Black & Blue Leather seats, Soundstream Amp & 5x7 speakers, Sony Headunit, Pioneer sub & Amp.
Under the Hood:- Superchips ECU Flash Tune, Denso Iridium plugs, KV85 Magnecor Leads, BMC CDA Induction.
Exterior:- Spoiler, clear side repeaters, Lowered (35mm) King Springs, Whiteline 22mm Rear sway bar, 2" cat back exhaust with a dual conversion, Konig 17" Hotswap with Kumho Rubber, HID's.
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