[Drivesthebeast]

darkpuppet,Mar 14 2007, 08:48 AM Wrote:

Drivesthebeast,Mar 14 2007, 09:43 AM Wrote:/\ pretty friggen good man...my car was under 100km's per tank when I sold it, but I never changed the fuel filter once while I had it...I ran 94 and 93 octane through it more than 50% of the time, as well as fuel injector cleaner at every oilchange...yeah I know, detergent city...lol
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I found that putting higher octane in a stock focus just hurt mileage. On the highway, it increased consumption by nearly 20%.

don't put in supreme unless you're tuned for it...otherwise it's just problems waiting to happen.
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Yeah, I only run 87 octane in the mustang most of the time (unless the bronze pumps are out of commish at shell), as that's what the engine calibration is setup for. On the highway I can get over 100km's per 1/4 tank, and for a V8, that's pretty impressive. However, I'll likely go to a 93 Tune if I get a C&L or WMS intake...usually with those things, the GT closes in on 300+ rwhp (stock averages around 270)...

Anyways, sorry to thread jack, hope that you get the problem resolved on your Foci...good luck!