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Corvette
C7 Forum
What gas stations to avoid?
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<blockquote data-quote="ByronF" data-source="post: 176354" data-attributes="member: 5196"><p>Found this pdf on ethanol content by gasoline supplier. It is based on Ontario gas retailers so local results may vary and it is a few years old.</p><p>Ethanol content in fuel starts as Federal legislation as a guideline with Provincial regulations supplementing those. In any event it is my understanding that all fuel pumps are required to carry a sticker indicating the content. </p><p>As best as can tell from current searches Shell and Esso 91 octane are ethanol free. No one supplies a 92+ octane fuel that is ethanol free.</p><p>So it appears you have 2 choices. Run 92+ octane and live with the ethanol content. This should not be an issue providing the vehicle is not stored for long periods as ethanol attracts moisture and can create a gummy residue in the tank over time. It can also be hard on parts of the fuel system but I suspect less so today as manufacturers have probably adjusted materials to compensate for this.</p><p>The other choice is to back down to 91 octane without ethanol. The only reason for the higher octane in my opinion is to reduce ping or knock in high compression engines. So the simple test - if you get no ping/knock at 91 and can enjoy the benefit of no ethanol that would seem to me the better way to go. The higher octane will not provide any performance or economy boost, just an avoidance of ping/knock.</p></blockquote><p></p>
[QUOTE="ByronF, post: 176354, member: 5196"] Found this pdf on ethanol content by gasoline supplier. It is based on Ontario gas retailers so local results may vary and it is a few years old. Ethanol content in fuel starts as Federal legislation as a guideline with Provincial regulations supplementing those. In any event it is my understanding that all fuel pumps are required to carry a sticker indicating the content. As best as can tell from current searches Shell and Esso 91 octane are ethanol free. No one supplies a 92+ octane fuel that is ethanol free. So it appears you have 2 choices. Run 92+ octane and live with the ethanol content. This should not be an issue providing the vehicle is not stored for long periods as ethanol attracts moisture and can create a gummy residue in the tank over time. It can also be hard on parts of the fuel system but I suspect less so today as manufacturers have probably adjusted materials to compensate for this. The other choice is to back down to 91 octane without ethanol. The only reason for the higher octane in my opinion is to reduce ping or knock in high compression engines. So the simple test - if you get no ping/knock at 91 and can enjoy the benefit of no ethanol that would seem to me the better way to go. The higher octane will not provide any performance or economy boost, just an avoidance of ping/knock. [/QUOTE]
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C7 Forum
What gas stations to avoid?
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