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The Water Cooler
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Why can't we can't get 93 octane?
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<blockquote data-quote="71buickfreak" data-source="post: 2801994" data-attributes="member: 8373"><p>No. The ECM operates within a set parameter and only adjusts the timing when the knock sensors trigger, it doesn't add timing until they ping and then back off. </p><p></p><p>You likely just got some really good quality fuel. I have had flukes like this before, no other change besides the brand of gas and got really good mileage and then the next tank is back to what it was. Fuel quality varies wildly from station to station, and that can change between tank fills (referring to the station's tank). </p><p></p><p>How many miles are on your engine? Carbon build up and worn parts can cause a decrease in performance that higher octane (or more likely formulation additives) may remedy. If you have some carbon build up in your combustion chambers, the engine may be knocking and the ecm is pulling timing to compensate. The higher octane fuel reduced the point at which the knock occurs, allowing the ecm to run the timing where it is supposed to be. I would suggest a cleaning product, like Seafoam or CRC 1-Tank Renew. I put some CRC in my 2002 2500HD (6.0 liter LS-series) on a road trip hauling a 24-foot race trailer. The first tank was normal, the second tank I picked up 2 mpgs while towing an 8500 lbs load, went from 6 to 8.</p><p></p><p>As was pointed out already, octane is only about controlling detonation. If you prefer to hear it from the horse's mouth-</p><p></p><p><a href="http://www.exxon.com/octane-rating" target="_blank">http://www.exxon.com/octane-rating</a></p><p></p><p>"The recommended octane level for most vehicles is usually octane 87, but be sure to check your owner’s manual. Some car models have high-compression engines, which are designed to utilize octane levels of 89, 91 or higher. Ordinarily, your vehicle won’t benefit from using an octane higher than your owner's manual recommends. But if your engine knocks or pings at the recommended octane level, you may need a higher octane gasoline to prevent knocking."</p><p></p><p>How many miles are on your engine? Carbon build up and worn parts can cause a decrease in performance that higher octane (or more likely formulation additives) may remedy. If you have some carbon build up in your combustion chambers, the engine may be knocking and the ecm is pulling timing to compensate. The higher octane fuel reduced the point at which the knock occurs, allowing the ecm to run the timing where it is supposed to be.</p></blockquote><p></p>
[QUOTE="71buickfreak, post: 2801994, member: 8373"] No. The ECM operates within a set parameter and only adjusts the timing when the knock sensors trigger, it doesn't add timing until they ping and then back off. You likely just got some really good quality fuel. I have had flukes like this before, no other change besides the brand of gas and got really good mileage and then the next tank is back to what it was. Fuel quality varies wildly from station to station, and that can change between tank fills (referring to the station's tank). How many miles are on your engine? Carbon build up and worn parts can cause a decrease in performance that higher octane (or more likely formulation additives) may remedy. If you have some carbon build up in your combustion chambers, the engine may be knocking and the ecm is pulling timing to compensate. The higher octane fuel reduced the point at which the knock occurs, allowing the ecm to run the timing where it is supposed to be. I would suggest a cleaning product, like Seafoam or CRC 1-Tank Renew. I put some CRC in my 2002 2500HD (6.0 liter LS-series) on a road trip hauling a 24-foot race trailer. The first tank was normal, the second tank I picked up 2 mpgs while towing an 8500 lbs load, went from 6 to 8. As was pointed out already, octane is only about controlling detonation. If you prefer to hear it from the horse's mouth- [url]http://www.exxon.com/octane-rating[/url] "The recommended octane level for most vehicles is usually octane 87, but be sure to check your owner’s manual. Some car models have high-compression engines, which are designed to utilize octane levels of 89, 91 or higher. Ordinarily, your vehicle won’t benefit from using an octane higher than your owner's manual recommends. But if your engine knocks or pings at the recommended octane level, you may need a higher octane gasoline to prevent knocking." How many miles are on your engine? Carbon build up and worn parts can cause a decrease in performance that higher octane (or more likely formulation additives) may remedy. If you have some carbon build up in your combustion chambers, the engine may be knocking and the ecm is pulling timing to compensate. The higher octane fuel reduced the point at which the knock occurs, allowing the ecm to run the timing where it is supposed to be. [/QUOTE]
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