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Hi, We have had our new '18 Envision Premium since May 25th. So far we have 3,025 miles clocked including one vacation trip. I have been using premium and mid grade fuel either Shell, Exxon or Mobil. I know some say you can and some say you can't use regular fuel but was wondering if anyone has been running theirs on it and if so how is the performance? Is it substantially reduced or have you developed pre ignition knocking? Any insight will be helpful. Thanks, Mark