Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 08-15-2012, 09:04 AM   #452
dyn085
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Pretty much everyone that has done the test has agreed to the fact that the ECU needs about 3 tanks. After that is the best time to drop back down to 87 in order to feel the performance loss.

A 22 cent difference is still less than $2.75 over the cost of refilling a completely bone-dry tank...less than $8.25 for three tanks (approx 1000 miles?) or less than $.00825 cost per-mile over regular...and that's assuming a 0% increase in mpg for the duration.
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