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Author Topic: gasoline that 87 or 89 or 91 Post a Reply Back to Topics
CORNHICK
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Message Posted: Mar 23, 2012 9:05:35 PM
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if the 87 octane gas is 0.12 more per gallon and the 89 octane is 0.12 cheaper and the 91 is 30 cents more per gallon which one should i buy if the 89 contains 10% ethanol ?
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reb4
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Message Posted: Mar 24, 2012 9:19:41 AM
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Is octane always the best determining factor?

According to this link, maybe not...

ANother link on subject...
Here's what exxon says.. (for balance, not recommending exxon)

"Why should I use your premium gasoline (91-93 octane) instead of regular (87) or midgrade (89)?
To find out what octane your engine needs, first check your owner's manual. The recommended level is often 87 octane. Some models have high compression engines which are designed to utilize the octane levels of 89, 91 or higher.

Ordinarily, your vehicle will not benefit from using a higher octane than is recommended in the owner's manual. But if your engine knocks or pings at the recommended octane level, you may need a higher octane gasoline to prevent the knock. Knocking may occur under certain conditions. A small percentage of vehicles may knock because of variations in engines of the same model due to manufacturing tolerances, or because of an unusual build-up of engine deposits. Other factors such as extremely hot weather, changes in altitude or hard driving conditions (like towing a heavy load) may also cause knocking. Many modern vehicles are equipped with an electronic device that detects and eliminates light knocking before you hear it."

Another link for more information... The Gas Factor

[Edited by: reb4 at 3/24/2012 9:21:08 AM EST]
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gamechanger2011
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Message Posted: Mar 23, 2012 11:39:19 PM
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Welcome!
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CORNHICK
All-Star Author Omaha

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Message Posted: Mar 23, 2012 11:38:36 PM
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ok will do thank you
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gamechanger2011
Champion Author Wichita

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Message Posted: Mar 23, 2012 9:07:46 PM
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Cornhick....buy the 89. It's the best value.
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