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Can I mix 91 octane with 100?

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Old Apr 20, 2006 | 09:43 AM
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JRbmx16
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Question Can I mix 91 octane with 100?
I have a 05 Evo flashed for 93 octane, the gas station i get my 93 from swiched to 91, but they also sell 100 octane race fuel. What i'm asking is if it would be safe to mix a little 100 with 91 to make up for the difference? Or should i just get my car reflashed for 91.
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Old Apr 20, 2006 | 09:44 AM
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lead
Originally Posted by JRbmx16
I have a 05 Evo flashed for 93 octane, the gas station i get my 93 from swiched to 91, but they also sell 100 octane race fuel. What i'm asking is if it would be safe to mix a little 100 with 91 to make up for the difference? Or should i just get my car reflashed for 91.

Lead or no lead? cat or no cat?
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Old Apr 20, 2006 | 09:47 AM
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no lead and no cat
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Old Apr 20, 2006 | 09:50 AM
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yeah it would not hurt anything mix 100octane with 91 is fine.....you will see the difference....
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Old Apr 20, 2006 | 09:52 AM
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how much 100 should i put in? A couple of gallons for a full a tank of 91?
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Old Apr 20, 2006 | 09:55 AM
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sounds good
Originally Posted by JRbmx16
how much 100 should i put in? A couple of gallons for a full a tank of 91?
that should do it
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Old Apr 20, 2006 | 10:12 AM
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Originally Posted by JRbmx16
how much 100 should i put in? A couple of gallons for a full a tank of 91?
Here is a chart that will show you the appropriate mixture.

http://www.sr20deracing.com/EVO/octane_chart.gif
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