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The ST isn't limiting power in 1st gear. Oil temp does limit RPM until it warms up.

It is best to assume the dealer will fill the car with regular and it will take about 100 miles or so before the computer fully recomputes to run a higher octane fuel. I have heard of Focus ST guys getting better MPG with premium, but I have not confirmed that. I mentioned to my wife that we should try in her Escape, but she did not like the idea. I have been running 93 octane only in the ST.
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