Hello I could not resist and had to chime in on this subject. Every once in a while this subject comes up. ----- Original Message ----- From: "secret_jedi_guy" > I have been sticking with 91 and I put in an octane booster. Why do you stick with 91 octane?? And why octane booster?? There must be something wrong with your engine. The DeLorean was designed for 87 octane fuel - unless you're outside the US, in that case yes - 91 is the correct one. Once again: USA - 87 octane gasoline, R+M/2 method Europe - 91 octane gasoline Stick with what the car was designed for. If the engine is running rough and you get poor mileage using the correct grade gas then there is something wrong. It should be fixed before it ends up being much bigger problem. Using gas of higher octane rating will result in carbon deposits in the combustion chambers and might lead to burning out the valve seats. BTW, stay away from 100 octane fuel. It is meant to be used in highly modified engines with increased compression and power output - hence the word 'racing'. Tom Niemczewski jamesik@xxxxx VIN 6149 Save the dream so you can live the dream... To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/