Switching Between Gasoline and E85
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
No special precautions need to be taken when switching back and forth between gasoline and E85 other than refueling events must be 11 liters (3 gallons) or greater, and the vehicle must remain in Closed Loop long enough, usually by the time the engine has maintained full operating temperature, to calculate the composition of the new blend in the tank.