Yes it's true that I don't have the car yet, but the concern is that I'm still in a position to deny the car if there is a wide spread known problem that I don't want to deal with. Plus there are many places that don't have 93 octane, so I would like to just get used to using one type of octane, ie Cheveron 91. It has already been recommended by the deal to use one type of gas and stick with it, because the car 'learns' to deal better with that particular gas and the type of additives the company puts in.