The "top tier fuels" sounds much like the Ford/BP marketing program back in 2008. When we bought our 2008 Escape, the owner's manual had a statement that read something like, "Ford and BP have joined our technologies to create a premium level fuel, especially blended to provide optimum performance in your new Ford. Available only at BP stations, this fuel will provide you with reliable service from your new Escape." On the inside of the fuel door was a sticker that read, "Ford recommends you use only BP fuel with a minimum octane rating of 87," and the green BP logo. Living in Louisiana and with the BP oil spill in the Gulf about that same time, I was "anti-BP" and that Escape ran just fine on "anything but BP"....
I'd suspect this GM Top Tier fuel is a similar "marketing strategy" with "GM's oil industry partners"......
