Quote:
Originally Posted by Excaliber
By the way, I wish I had dime for everytime someone has told me that high octane fuel makes more horse power or is somehow 'stronger' than regular fuel. It is simply more 'refined' you might say, in that it RESISTS self ignition, in other words it's HARDER to light this fuel than regular fuel, that about covers it.
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I got this information off of the DOE web site some years back. I tried to find it on the site to provide a link but couldn't. So this is what I copied some years back.
Gasoline 92 Oct 115000 btu/gal
Gasoline 89 Oct 110200 btu/gal
Gasoline 87 Oct 105000 btu/gal
Believe it or not premium has about 10% more energy.
My 1992 crown vic always got about 27 mpg highway on premium and about 24 mpg highway on 87 Octane, which is just about 10% more. The mpg was checked back about the time this data was taken.
You can choose to count me amoung all the idiots that keep telling you this.
I believe octane measures the rate a fuel burns, rather than how hard it is to light it. But here is the DOE official definition.
Octane rating: A number used to indicate gasoline's antiknock performance in motor vehicle engines. The two recognized laboratory engine test methods for determining the antiknock rating, i.e., octane rating, of gasolines are the Research method and the Motor method. To provide a single number as guidance to the consumer, the antiknock index (R + M)/2, which is the average of the Research and Motor octane numbers, was developed.