Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Octane and Mileage

Octane has nothing to do with fuel economy...directly.

Pulling timing is not done at cruising speeds; rather it is done at light load to full throttle loads and is based on knock. When the throttle is reduced back to light cruise loads the timing should be the same or comparable.

Therefore, octane in this case has nothing to do with your fuel economy.