I think the 91 in the manual refers to 91 in British gas, which is different than U.S. I have always run mine on 87 w/o any problems. John Yeoman --- In dmcnews@xxxx, "mccarthy410" <mccarthy410@xxxx> wrote: > 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.