Interesting tip. Thanks, SkiTour.We use 87 octane, mostly Shell or Mobile. The CT runs just fine on it as does our Ridgeline with the same engine. There is a note in the manual however about not using gas with MMT in it. I spoke with the dealer's service techs about it and got refered to a website. After a bit of web-work, it turns out that MMT is an additive that is used in lesser quality gas to make it burn like higher octane/better quality. It is not good stuff and should be avoided.
The website is www.toptiergas.com. It has a reasonable explanation and, under the "retailers" tab, it lists which fuels have committed to not using MMT.
Not exactly, On the fuel door it say NO E-85. But the owners manual says "Your vehicle is designed to operate on oxygenated gasoline containing up to 10% ethanol by volume and up to 15% MTBE by volume. Do not use gasoline containing methanol". And it says do NOT use MMT additives. And in parts of Nebraska (the corn belt) the cheapest blend is 10% ethanol and it is 89 octane, the regular unleaded is 87 octane and cost about 5 to 10 cents more. I have used both and it seem the 87 octane gets slightly better Mpg. But usually I'm a cheap a** and use the ethanol blend .If I remember corectly the owner's manual also says to stay away from ethanol fuels