- #2726 of 2773
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Re: Fuel Grade [jaguarxj8l]
by gregg_vw
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Sep 16, 2008 (12:18 pm)
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Replying to: jaguarxj8l (Sep 15, 2008 6:44 pm)
Nothing bad per se will happen, except you will get a few less hp and slightly degraded gas mileage. Considering that the difference in cost between regular grade and premium is often no more than 20 cents, the savings are usually not worth it. Now, if you have the supercharged engine, I wouldn't use regular at all under any circumstances, but for naturally aspirated engines these days, the computer will take care of adjusting for a lower octane.
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- #2727 of 2773
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Premium Only
by hofiii
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Sep 17, 2008 (5:04 am)
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I believe that it says that Premium is"required" not recommended or at least mine does. I wouldn't use the regular gas. The engine is designed to specs that require premium. It's up to you.
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- #2728 of 2773
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Re: Remote Battery [jaguarxj8l]
by euphonium
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Sep 17, 2008 (11:56 am)
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Replying to: jaguarxj8l (Sep 15, 2008 6:38 pm)
Visit the nearest Radio Shack.
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- #2729 of 2773
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Re: Fuel Grade [jaguarxj8l]
by euphonium
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Sep 17, 2008 (11:58 am)
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Replying to: jaguarxj8l (Sep 15, 2008 6:44 pm)
If you don't like rattles in the trunk area, why would you provide rattles under the hood by using inferior fuel? 
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- #2730 of 2773
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Re: Fuel Grade [euphonium]
by gregg_vw
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Sep 17, 2008 (12:43 pm)
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Replying to: euphonium (Sep 17, 2008 11:58 am)
It won't "rattle" and it is not inferior fuel. Regular grade is lower octane and therefore takes less energy to ignite. On older cars which required higher octane, you would get knock (and possibly serious damage) with the pre-ignition of lower octane. Current engines adjust to the octane they are fed. Those that are set up to use premium obtain their hp and mpg ratings using it. Use a lower octane and you will likely have less hp and slightly less mpg. That is the main reason it makes little sense to use it. You see no savings, and you have less power (which protects the engine from pre-ignition).
Supercharged engines are an exception, as the electronics may not be able to adequately adjust to an octane change under more extreme conditions.
On the other hand, most cars that take regular fuel are not set up to gain hp from using premium. Using premium when your vehicle calls for regular may net you less mpg, rendering premium the "inferior" fuel in that case.
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- #2731 of 2773
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Re: Fuel Grade [gregg_vw]
by euphonium
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Sep 19, 2008 (3:00 pm)
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Replying to: gregg_vw (Sep 17, 2008 12:43 pm)
95 Thunderbird 4.6 V8 111000 miles
94 Lincoln Twn Car 4.6 141000 miles
Each runs better and quieter using Mid Grade or 89 Octane. My source for fuel does not inclue Ethenal either.
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- #2732 of 2773
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Re: Fuel Grade [euphonium]
by gregg_vw
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Sep 22, 2008 (5:05 am)
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Replying to: euphonium (Sep 19, 2008 3:00 pm)
They probably do. Early 90s engines weren't as efficient at adjusting to octane changes.
You are fortunate BTW because here in WI it seems that all mid-grade gas has ethanol in it. Consequently, I avoid mid-grade.
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- #2733 of 2773
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Re: Fuel Grade [gregg_vw]
by bhill2
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Sep 23, 2008 (12:00 pm)
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Replying to: gregg_vw (Sep 17, 2008 12:43 pm)
You are undoubtedly correct that the engine will not be damaged by using regular fuel. But as hofiii noted, Jaguar says that premium fuel is 'required' which, in my mind, means that if you use regular you deserve what you get. Like hofiii, I go with premium; it is a Jag after all.
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- #2734 of 2773
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Re: Fuel Grade [bhill2]
by gregg_vw
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Sep 23, 2008 (12:33 pm)
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Replying to: bhill2 (Sep 23, 2008 12:00 pm)
Agreed. Why would anyone want to put regular in it? It is just good to know that if you have to use it for some reason, based on lack of available premium, fueling up along the side of the road, etc., you can do it without harming your Jag.
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- #2735 of 2773
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by m4d_cow
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Oct 12, 2008 (12:28 am)
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Can anyone tell me how much should I spend on an 06 CPO XJR? A dealer's listing it for "special price" $31060. Great deal or theres room for negotiation?
Any significant problems w/ this model year I should be aware of?
Thanks
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