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I've had several different Foci (Focuses? Focus's?) and a couple Escorts over the years, and my SOHC Ford's have always done really well on e-10 to e-30. It might be worth your time to try a couple tanks of 89 e-10 just to see what/if you are actually gaining running 87 octane e-0. Around here e-10 is almost always $0.10 to $0.13 cheaper, and e-30 can run anywhere from $0.30 to $0.45 cheaper...so I'm willing to give up a mpg or 2 for an overall cheaper commute.
That is some really good economy for a Focus Sedan (assuming its not a wagon anyway). Good call on the air pressure, seemed that my '01 Sedan would roll forever in neutral, had to really plan my exits off of the highway accordingly. Keeping the revs down with that low geared 1st took some adjustment as well. Good job, and keep us posted in the future.
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