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Old 10-14-2015, 03:51 PM   #41
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Originally Posted by NanoSour View Post
I'm no expert, but a pretty decent back yard mechanic and here's my take. Regardless of Octane in the tank, you can get almost any engine to knock by feeding it the wrong mixture for a given engine RPM.
I'm not an expert either, but experts have told me that modern engine control systems will cut timing when they detect knock, and if they still detect knock, they will dump in fuel. So you could probably get it to knock, but it wouldn't knock for long.

I still wouldn't try this with a purpose-built high horsepower engine.
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Old 10-22-2015, 10:20 AM   #42
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Here's an explanation for part of the increase in higher octane gasoline. As pump prices drop, U.S. motorists splurge on premium gas | Reuters
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For the second time in the past decade, a sharp fall in pump prices has triggered a spike in demand for the higher-octane fuel that has far outpaced the overall rise in consumption.
In the first four months of the year, sales of premium grade gasoline - which makes up around a tenth of the market - surged by 12.6 percent, according to the latest data available from the U.S. Energy Information Administration. Regular grade sales rose by only around 3.7 percent during the period.

As the price for gas falls, some motorists switch from low to higher octane.
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Old 10-23-2015, 04:52 PM   #43
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I have also read in a different forum that there is no difference in the amount of energy per gallon, so there cannot be any difference...
I think that may be a non-sequitur.

Mike D.
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Old 10-23-2015, 04:58 PM   #44
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Here's an explanation for part of the increase in higher octane gasoline. As pump prices drop, U.S. motorists splurge on premium gas | Reuters

As the price for gas falls, some motorists switch from low to higher octane.
I think it's a status thing... "I filled up my Honda with Premium today..."
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Old 10-23-2015, 05:04 PM   #45
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Just sold my premium gas car (Subaru Legacy GT) today... sorta sad... I really liked the car but we needed something bigger and it was so low DW was uncomfortable getting in and out of it. I'll miss the performance though.
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Old 10-23-2015, 05:22 PM   #46
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Just sold my premium gas car (Subaru Legacy GT) today... sorta sad... I really liked the car but we needed something bigger and it was so low DW was uncomfortable getting in and out of it. I'll miss the performance though.
oh man I love LGTs - those are fun (and they don't make them anymore)
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Old 10-23-2015, 07:45 PM   #47
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I think that may be a non-sequitur.

Mike D.
Well, I was quoting about mileage, so the second one was referring to that....


But, I can see how a quote out of context does look strange....
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Old 10-24-2015, 04:03 PM   #48
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I think it's a status thing... "I filled up my Honda with Premium today..."
When did being an idiot become a status symbol?
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Old 10-24-2015, 04:07 PM   #49
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When did being an idiot become a status symbol?
Only in his own mind is he exhibiting status..
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Old 10-24-2015, 07:39 PM   #50
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My gas hog suburban 7.4 engine runs fine on regular.

My 95 Jaguar prefers mid grade gas. Per the design engineer of the ignition and fuel control computer and frequents one of the jaguar forums the design was for what we in US call mid grade gasoline.

The top tier is pure waste of money, while the low grade will cost performance when you stick your foot in it (big time) also in normal driving (not so much). The ignition control program has the ability to retard ignition timing on a per cylinder bases, the knock sensor is a superb design. He also noted that original design was a bit conservative and an additional 5 degrees of timing advance overall is permissible. Can do up to 7 degrees but the knock sensors would be more active negating the occasional benefits.

Unlike some GM designs, the crankshaft pickup location which determines base timing can be modified on the Jaguar 6 cyl inline engine. I have done so. It is noticeable and verifiable improvement via butt dyno, real dyno and MPG.
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