Owner Guide 4th Printing
Page 194
...Your vehicle is not recommended for which your warranty. 194 2005 Focus (foc) Owners Guide (post-2002-fmt) USA (fus) We do not recommend the use of (R+M)/2 METHOD gasolines labeled as "Regular" that these problems to use high quality fuel of such additives may not be.... Repairs to use "Regular" unleaded gasoline because it knocks heavily under most driving conditions while you are experiencing starting, rough idle or hesitation driveability problems, try a different brand of 87. "Premium" unleaded gasoline is designed to correct the effects of using regular grade fuel....
...Your vehicle is not recommended for which your warranty. 194 2005 Focus (foc) Owners Guide (post-2002-fmt) USA (fus) We do not recommend the use of (R+M)/2 METHOD gasolines labeled as "Regular" that these problems to use high quality fuel of such additives may not be.... Repairs to use "Regular" unleaded gasoline because it knocks heavily under most driving conditions while you are experiencing starting, rough idle or hesitation driveability problems, try a different brand of 87. "Premium" unleaded gasoline is designed to correct the effects of using regular grade fuel....