Quote Originally Posted by AveoBro View Post
Any gas works fine. That manual is just marketing and sponserships and increase revenue.

Smoke and mirrors, my friend.
It's not just smoke and mirrors or marketing or sponsorships. It's so that people put gas that conforms to a certain standard and cover GM's ass in case someone decides to put racing fuel in and blow the engine up. They have to recommend at the very least a product that conforms to an international standard regardless of where it is purchased.