Octane Numbers?
#1
04-23-2008, 12:21 PM
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Octane Numbers?
I just read an article suggesting that you can use regular (or mid-grade) gasoline on cars that call for premium gas. The article indicatedthat the exception was if the car was supercharged (or turboed).
I have another car this is supercharged (and tuned for a specific octane). However, my 2004 XK8 is totally stock. In CA, the octane grades are 91, 89 and 87. Could I use one of the lower grades on a stock XK8?
I have another car this is supercharged (and tuned for a specific octane). However, my 2004 XK8 is totally stock. In CA, the octane grades are 91, 89 and 87. Could I use one of the lower grades on a stock XK8?
#2
04-23-2008, 12:51 PM
Veteran Member
#3
04-23-2008, 01:02 PM
RE: Octane Numbers?
Bluejay....keep using the 91. The lower grades will cause pinging and will be detrimental to the combustion chamber, plugs, injectors. Long term it is more expensive to use the lower grade fuel. Only a couple bucks extra for the tank fill up to use premium. Thats alot of fill ups to pay for lets say, injector rail. Jags always run better on premium fuel.
#4
04-23-2008, 01:04 PM
RE: Octane Numbers?
If you have an 18.5 gal gas tank like the S type the diff. between 89 octane and 91 octane is 10 cents a gal. thats $1.85 is that much of a saving worth it? I've been on highways were they ran out of 93 or 91
so I used 89 without any problem at the time. but i'll stick with the mfr. recommendations on what gas to use.
so I used 89 without any problem at the time. but i'll stick with the mfr. recommendations on what gas to use.
#5
04-23-2008, 01:16 PM
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Posts: n/a
RE: Octane Numbers?
Thanks for the responses.
I hadn't really thought about it until I read the article this morning. I just didn't know if it would matter on a stock car.
I've noticed that there are a number of technical peoplethat post here, so I knew that I would get some good advice.
[sm=smiley20.gif]
I hadn't really thought about it until I read the article this morning. I just didn't know if it would matter on a stock car.
I've noticed that there are a number of technical peoplethat post here, so I knew that I would get some good advice.
[sm=smiley20.gif]
#6
04-23-2008, 09:44 PM
RE: Octane Numbers?
2 Cents / FYI
There are only two grades of raw gasolinelow octaneand high octane.
Themid-grade is mixed at the pump so that there is a price choice for the consumer.
Every thing else is just additives (anti-knock, stabilizers, cleaners, etc...) added when the delivery guy picks up fuel at the distribution center.
Raw gas +valero additives = valero gas
Raw gas + exxon additives = exxon gas
You get the idea.
I use high octane. My kitty likes it better.
And a happy kitty is a fun to drive kitty.
There are only two grades of raw gasolinelow octaneand high octane.
Themid-grade is mixed at the pump so that there is a price choice for the consumer.
Every thing else is just additives (anti-knock, stabilizers, cleaners, etc...) added when the delivery guy picks up fuel at the distribution center.
Raw gas +valero additives = valero gas
Raw gas + exxon additives = exxon gas
You get the idea.
I use high octane. My kitty likes it better.
And a happy kitty is a fun to drive kitty.
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