Not only do you have to find the right fuel you also have to find the right Oil, just found out today GMC dealer that serviced my truck did so with the wrong oil.
Any thing after I believe Jan 07 needs CJ-4 oil this is for Ford,Dodge and GM products. They are correcting it thursday no questions ask. They had to go to Wally World to get the correct Mobile oil.

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Ed & Maxine Thompson
2006 31 BWFS Sunnybrook
2007.5 GMC 3500 Dually C/C D/A
Reese Signature 18 K Hitch
GM Break Controller