Premium gas = 93 Octane?
#1
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I recall that Jaguar recommends using premium gas, but does that necessarily translate to 93 Octane? What do you guys use in your XJ6? I don't mind paying for the higher octane but if it's not necessary, I won't put that in. I am used to cars using 87, unless they start pinging.
I did a search and nothing came back for the X300. If this has been asked before, my apology then. Thank you!
I did a search and nothing came back for the X300. If this has been asked before, my apology then. Thank you!
#2
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mounty (08-14-2012)
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I asked my brother, a petroleum engineer, about this long ago and he chuckled and said, "It doesn't work that way." I never asked for an explanation, since I'm not a PE.
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I recall that Jaguar recommends using premium gas, but does that necessarily translate to 93 Octane? What do you guys use in your XJ6? I don't mind paying for the higher octane but if it's not necessary, I won't put that in. I am used to cars using 87, unless they start pinging.
I did a search and nothing came back for the X300. If this has been asked before, my apology then. Thank you!
I did a search and nothing came back for the X300. If this has been asked before, my apology then. Thank you!
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#8
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In the US, we have mostly three choices: 87, 89 and 93. Sunoco is the only one that sells 91. So really no choice but to go with 93.
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#14
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Mixing low octane fuel with high octane will not give you a medium grade octane. The molecules will be either 87 or 93. They do not reformulate in your gas tank.
An underground fuel storage tank can be multi-chambered. Holding two or three grades of fuel. Most gas stations don't have property large enough for 6 underground storage tanks. 87,89,93,e85,diesel and sometimes kerosene.
An underground fuel storage tank can be multi-chambered. Holding two or three grades of fuel. Most gas stations don't have property large enough for 6 underground storage tanks. 87,89,93,e85,diesel and sometimes kerosene.
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The famed Sunoco 190-260 range of gasolines back in the '60s was achieved in this second manner, so the concept is nothing new. It's very common practice today for someone to add some 108 'racing' gas to a tank of 91 octane to satisfy the anti-detonation needs of an old school high compression engine.
#17
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Some other factors could be a malfunction, which I'd agree then would need to be repaired instead of covered up by higher octane fuel.
But in theory a very hot environment could contribute too. So it may be possble that in a hot climate higher octane fuel could help reduce knock.
And of course, anyone modifying something like boost levels may need to look at higher octane fuel if they are seeing KR.
In the absence of 91 octane fuel though, I'd get 93 to avoid any knock issues. That's what I have to do with my 95 Eaton SC'd Riviera too.
Al
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#18
#19
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As ever with threads on this topic, widely differing opinions will never result in a clear conclusion. Go with whichever rationale you feel makes most sense. For me that means using the fuel rating recommended in my handbook. That rating was determined as optimum for a reason, by Jaguar engineers who have most likely forgotten more than I will ever know.
#20
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As ever with threads on this topic, widely differing opinions will never result in a clear conclusion. Go with whichever rationale you feel makes most sense. For me that means using the fuel rating recommended in my handbook. That rating was determined as optimum for a reason, by Jaguar engineers who have most likely forgotten more than I will ever know.
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If I can find 91, I'll put it in, right now we have 87, 89 and 93 as our only choices here in my neighborhood until then though.
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