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The Water Cooler
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Yet Another Reason To Hate Ethanol
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<blockquote data-quote="vvvvvvv" data-source="post: 2192313" data-attributes="member: 5151"><p>For what it's worth, compression ratio is not all that affects the octane requirements of the engine. You also have the issue of how well the fuel and air mix throughout each cylinder, mean piston speed, cylinder heat control, overall efficiency between sucking and blowing, emissions targets, etc.</p><p></p><p>That said, I just always run what the manual says, even if I don't hear or detect any problems with lower octane fuel. The difference between 87 and 91 is typically $0.30/gal. If you put 40K/yr on a car that gets 30 mpg, you have a difference of $400/yr in fuel costs. Assuming an average price of 87 is $3.50/gal for the year, you were already paying $4,665.50 in fuel costs to drive your car on 87 rather than the manufacturer-recommended 91.</p><p></p><p>Remember, too, the pump could be off by 0.02 gallons either way and still pass Oklahoma Corporation Commission requirements. It doesn't sound like a lot, but at the theoretical 1,333 gallons above, that's 26.66 gallons that the pump could read either way over the course of your year, or $93.31 - $101.31 that you could be paying more (or less) at the pump.</p></blockquote><p></p>
[QUOTE="vvvvvvv, post: 2192313, member: 5151"] For what it's worth, compression ratio is not all that affects the octane requirements of the engine. You also have the issue of how well the fuel and air mix throughout each cylinder, mean piston speed, cylinder heat control, overall efficiency between sucking and blowing, emissions targets, etc. That said, I just always run what the manual says, even if I don't hear or detect any problems with lower octane fuel. The difference between 87 and 91 is typically $0.30/gal. If you put 40K/yr on a car that gets 30 mpg, you have a difference of $400/yr in fuel costs. Assuming an average price of 87 is $3.50/gal for the year, you were already paying $4,665.50 in fuel costs to drive your car on 87 rather than the manufacturer-recommended 91. Remember, too, the pump could be off by 0.02 gallons either way and still pass Oklahoma Corporation Commission requirements. It doesn't sound like a lot, but at the theoretical 1,333 gallons above, that's 26.66 gallons that the pump could read either way over the course of your year, or $93.31 - $101.31 that you could be paying more (or less) at the pump. [/QUOTE]
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