258 DRIVING AND OPERATINGOther files should not be stored onthe same SD card as the surroundvision recorder files. Storing other fileson the same card may increaserecording start up and playback timeor result in a loss of data. An errormessage may be displayed if nosurround vision recorded video file isavailable for playback.FuelTop Tier FuelGM recommends the use of TOP TIERDetergent Gasoline to keep the engineclean, reduce engine deposits, andmaintain optimal vehicle performance.Look for the TOP TIER Logo or seewww.toptiergas.com for a list of TOPTIER Detergent Gasoline marketersand applicable countries.Recommended Fuel (3.6LV6 Engine)Use regular unleaded gasoline meetingASTM specification D4814 with aposted octane rating of 87 — (R+M)/2— or higher. Do not use gasoline witha posted octane rating of less than 87,as this may cause engine knock andwill lower fuel economy.Do not use any fuel labeled E85 orFlexFuel. Do not use gasoline withethanol levels greater than 15% byvolume.