11-17-2008, 09:51 PM | #51 | |
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Doubting though if your getting 20mpg you would see any difference.
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11-18-2008, 12:12 AM | #52 | |
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it's an 07... 4.7 not the big 5.8L they came out with in 08. but he's gotten 25 on more than a couple tanks keeping it under 65 (he lives a ways out so most of his driving is highway with little to no traffic). |
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11-18-2008, 12:35 AM | #53 | |
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BTW on topic,you should regularly check your tire pressure and stay on top of your car's maintenance. |
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11-18-2008, 12:48 AM | #54 | |
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11-18-2008, 01:20 AM | #55 |
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Yeah I doubt the mpg increase from prem vs reg. Go talk to a engine builder... if the motor isn't built for the higher octane you're wasting your money.
Now granted I have had a car before that ran better on mid grade cause it was getting pre-ignition knock. So things happen. But Ford's also made the Mustang GT to run on 87... but if you want to throw more timing at it... you'll need more octane. |
11-18-2008, 02:54 AM | #56 | |
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1. it costs more/requires more effort to refine 2. it has higher taxes attached to it 3. the necessary additives increase the cost 4. the oil to fuel ratio is lower So what is the primary reason? |
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11-18-2008, 02:57 AM | #57 |
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up until Gas went over $2... diesel was always cheaper than even regular...
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11-18-2008, 03:14 AM | #58 | |
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The main reason for higher octance is to resist knock, but that wasn't the discussion. Less refineries. Period.
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11-18-2008, 09:57 AM | #59 | |
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I did some reading yesterday, and the point you're making about chain length does make some sense, Carbon-Carbon bonds have more energy than Carbon-Hydrogen bonds, But there was some hedging that most of the differences were due to density, not octane. And everyone I've ever heard on the topic has said that higher octane doesn't improve mileage. I'd be surprised that you can measure a difference based on octane alone if your engine doesn't need higher octane or you don't adjust it for higher octane. Your bike just might need a bit more octane, hence the reason you get a 4-5% bump in mileage. And with more advanced engine management higher octane might very well give better mileage, but only be cause engine management retards the timing a bit with lower octane(in other words read your manual and use the fuel grade they tell you to). |
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11-18-2008, 09:58 AM | #60 |
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