Welcome to the forum
Go to 98 octane. Even though its a bit more expensive, it equals it out in better mileage.
If u switch to 98 octane and the sound stops, then its most certainly pinging. I dont think ford can do much abt pinging than advising u to switch petrol.
If the sound doesnt stop with 98 octane, its something else and u can pester ur dealer to fix it. Switching petrol atleast would bring some clarity abt the prob.
And hey, once u go 98, U'll never wanna go back
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2004 LR Ford Focus Zetec
3 door, Panther Black, Manual, 17" MP3 Alloys, SVT Airbox with K&N panel filter, SVT Snorkel, Leather Gear Knob and Steel Handbrake Cover, ST170 pedals, ST170 Lower grille, CFM UDP
Not too soon : Focus sport/Borla Exhaust, Throttle body
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