Hi, I am a new prospective owner of a DeLorean, before I buy, I'm gathering all info I can. One question comes to mind, I know the manual and several sites say to use 91 Octane fuel, only thing close to it is 93, and that does get expensive. Can 87 or 89 Octane be used with no ill effects? I'm told how the Europeans and how the U.S. rates gasoline are two different things, any truth to this? Thanks.