I dont know the fastest but My friend has done it in low 7's. Name is Carldelle Patrick. New Bern NC. One time he hit a high 6.
2008 GXSR 1000 takes 3.2 quarts of oil, this includes the oil used to fill the filter before installing.
Your mainfuse is at the starter relay follow the red battery wire and it goes to that relay look under the plastic cover