I just got my crossfire, and i wasn't sure if you use the regular (87) or the (89) or the premium (91). Does it make a difference?

 

shell 92 or 93 octane, whatever is the highest.

 

top grade always

 

unless your car specifically calls for higher octane fue (such as the srt6)l you are wasting your money unless you have significant mods on your engine that would require the higher octane fuel to reduce the change of detonation (such as running an aftermarket supercharger or turbo on a car that came NA from the factory).

I run 93 octane for daily driving and I add Klotz octane booster/oxygenator when at the track to raise it to 98 octane. It is a true octane booster not that crap at the parts store that only raises your octane from 93 octane to 93.1 octane. The klotz is $60 a gallon and raises the octane of gas by 2.5 numbers (93 octane to 95.5 octane) for every ounce you add per gallon of gas. I add 2 oz per gallon to get 98 octane.

 

only 91or higher ! Why would you want 98 if it runs good on 91-93 does it run any better on 98 ?

 

it is safer when running the car on the track. When you are running it hard, the temps are hotter and the chance for detonation is higher it is better to run a little higher octane fuel to prevent the car from detonating and pulling timing. If the car does not pull timing then that equals more consistent times at the track. If you raise boost it is better/much safer to run a higher octane at the track also. The Klotz also raises the oxygen level in the fuel as well which CAN mean as much as 8% more hp. Yes it is better to run a higher octane for a forced induction or high compression motor at the track.

 

I usually do the premium at 92 octane. If I happen to be at a Sunoco station, I use Ultra 93. I've never used the Shell premium gas. Is it better than the others?

Bob

 

Book say premium fuel only (along with notification on the gas door), therefore premium it is!

 

Your going to hear that it's ok to use 87 octane on one hand and on the other hand you will hear that you and your first born will die if you don't use 93 octane. It's a typical Newbe question (it was one of mine) and by using the search feature in the forum, you can see all of the opinions. For me, I use the 91 to 93 octane for piece of mind. The premium fuel is only 4% to 5% more.

 

All crossfires call for premium fuel...

 

I use only a top tier 93 octane.
keeps my pipes clean... if you know what I mean... .

 

would using 89 grade hurt my car in any way?

 

Check this thread out:
https://www.crossfireforum.org/forum...ferrerid=17466

 

Usually, gas is priced in $.10 increments so going from 87 to 93 would average $2.80 more per full tank. To me, it is worth the peace of mind.

 

Something that I thought about. I have a '05 and wonder what octane the previous owner used. Anybody that buys a used Crossfire will always wonder unless you know the owner.

 

Just use premimum when the changed the engine on mine I was glad so now i know what oil and everything has been in it...like being the first owner again....

 

I won't be using any of those after this week......................105 octane FTW(For The Win)!!!

 

Marathon 93 octane. I won't patronize Shell anymore since their actions following 9/11. But I know a lot of folks on here really like their fuel as well.

 

I use shell for two reasons, its close to my house and its the cheapest of the 4 stations in my area. I use their 92 octane.
Pat

 

I always fill with 92 Octane. I'd go crazy if I had to deal with 87 octane in my tank.

I've recently been experimenting with adding Toluene to bring the octane up a few points. The car seems to like it a lot down low in the revs.