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Civic VX - Advance timing & Fuel
I want to advance the timing on my Civic VX to 18 degrees. But, i'm wondering if I will need to use a high octane gasoline to go with the advanced timing?
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1992 Civic VX - 45.9mpg *hoping to get this above 50mpg+ soon* 
2011 BMW 335D - 34.9mpg mixed putting down 320whp / 510wtq **CMON 35MPG!!!**
2006 EVO IX - 22mpg mixed putting down 400whp / 400wtq
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