Just a quick question. I have been wondering how the flex fuel cars adjust to the fuels. Can the vehicles adjust for premium use as far as making use of the available octane? Or are they just prepared to enrich the mixture for the use of E85? The reason I ask is because a friend has a new 2011 Chevy HHR 2.2 VVT and I wonder if he would get better power out of premium like my old 2.4 HHR did since it required premium. I assume it probably would not adjust itself to the premium but I wonder if anyone has more info?