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Old 07-23-2012, 08:44 PM   #1355
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What I Drive: White 2012 SE Sport, Auto, 203A.

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I did not realize the Focus was 12:1. I now accept that it probably will benefit from 93 octane fuel, especially considering that the owner's manual says that it will.

So now I just want to know how much it benefits, so I can see if it is worth using.

If 93 fuel costs 15% more, and I gain less than 15% increase in MPG, then it is not worth it for fuel economy.

Now if it gains HP, then that is another matter, as I can justify it by acceleration gains rather than on economy gains.

Top gear tested what - a Mustang? How much HP gain and what was the HP? We can then scale it to the Focus HP and come up with a guesstimate.
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