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Corvette
C7 Forum
What gas stations to avoid?
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<blockquote data-quote="Rruuff Day" data-source="post: 241843" data-attributes="member: 2217"><p>Has your car always pinged with 91 octane Murray? There are lots of things that can make an engine ping, not limited to carbon build up, timing, air/fuel adjustments and/or a faulty knock sensor if it has one. The ECU, amongst doing other things, is designed to momentarily retard timing when it senses detonation occurring. Maybe you just need to find an empty stretch of highway somewhere and clean her out. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> </p><p></p><p>Excerpt from your owners manual:</p><p><em>Gasoline Octane Use</em></p><p><em>Premium unleaded gasoline with a posted octane of 91 or higher for best performance. You may also use middle grade or regular unleaded gasoline rated at 87 octane or higher, but your vehicle’s acceleration may be slightly reduced. If the octane is less than 87, you may get a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible</em></p><p></p><p>Ethanol does have a much higher octane rating than gasoline. Canada bulk fuel facilities are mandated to use 15% ethanol (by volume) in our gasoline. Since 87 and 89 octane are by far the most used consumer gasoline, the companies that choose to still offer ethanol free 91 fuel add 5% ethanol to their low grade gasoline which achieves an octane of 87 and 10 % to achieve an octane of 87. That allows them to sell their premium 91 ethanol free. PC 94 is indeed a higher octane but they use ethanol to get it there. Smart of you not to store your car with ethanol fuel though. Almost all the fuel in the US now has ethanol and I would guess that in the future, Justin will close some loopholes and we will be in the same boat. E15 is also fast becoming the norm in a lot of Countries.</p><p></p><p>I'm tempted to start a Go Fund Me to raise a few billion, drill a well on my farm and build a gasoline processing plant. Ethanol free high octane just for Corvette owners. Shame we don't have a pipeline or I'd send you down some.... lol....</p></blockquote><p></p>
[QUOTE="Rruuff Day, post: 241843, member: 2217"] Has your car always pinged with 91 octane Murray? There are lots of things that can make an engine ping, not limited to carbon build up, timing, air/fuel adjustments and/or a faulty knock sensor if it has one. The ECU, amongst doing other things, is designed to momentarily retard timing when it senses detonation occurring. Maybe you just need to find an empty stretch of highway somewhere and clean her out. ;) Excerpt from your owners manual: [I]Gasoline Octane Use Premium unleaded gasoline with a posted octane of 91 or higher for best performance. You may also use middle grade or regular unleaded gasoline rated at 87 octane or higher, but your vehicle’s acceleration may be slightly reduced. If the octane is less than 87, you may get a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible[/I] Ethanol does have a much higher octane rating than gasoline. Canada bulk fuel facilities are mandated to use 15% ethanol (by volume) in our gasoline. Since 87 and 89 octane are by far the most used consumer gasoline, the companies that choose to still offer ethanol free 91 fuel add 5% ethanol to their low grade gasoline which achieves an octane of 87 and 10 % to achieve an octane of 87. That allows them to sell their premium 91 ethanol free. PC 94 is indeed a higher octane but they use ethanol to get it there. Smart of you not to store your car with ethanol fuel though. Almost all the fuel in the US now has ethanol and I would guess that in the future, Justin will close some loopholes and we will be in the same boat. E15 is also fast becoming the norm in a lot of Countries. I'm tempted to start a Go Fund Me to raise a few billion, drill a well on my farm and build a gasoline processing plant. Ethanol free high octane just for Corvette owners. Shame we don't have a pipeline or I'd send you down some.... lol.... [/QUOTE]
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C7 Forum
What gas stations to avoid?
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