nastang87xx
Well-Known Member
There's a lot of misguidance in here.
Ethanol != octane
Octane != ethanol
If a fuel is 91 it's 91 regardless of the ethanol content. 100% gasoline 91 octane rated fuel is still 91 as is 90% gasoline + 10% ethanol 91 rated fuel is still 91. YOU DO NOT GET ANY ADDITIONAL KNOCK RESISTANCE FROM ADDITIONAL ETHANOL IF YOU FUEL IS RATED FOR A FIXED OCTANE RATING.
Go look at an E85 pump. Notice anything? No sign of an octane rating anywhere. E85 is actually a mystery when it comes to what Octane rating you're really at. And in some areas E85 isn't always 85% ethanol either. It will depend on your local/state laws on what E85 is. Example, some laws will say all they owe you in the fuel is 75% ethanol. GENERALLY though most E85 is above 100 octane equivalent.
Ethanol != octane
Octane != ethanol
If a fuel is 91 it's 91 regardless of the ethanol content. 100% gasoline 91 octane rated fuel is still 91 as is 90% gasoline + 10% ethanol 91 rated fuel is still 91. YOU DO NOT GET ANY ADDITIONAL KNOCK RESISTANCE FROM ADDITIONAL ETHANOL IF YOU FUEL IS RATED FOR A FIXED OCTANE RATING.
Go look at an E85 pump. Notice anything? No sign of an octane rating anywhere. E85 is actually a mystery when it comes to what Octane rating you're really at. And in some areas E85 isn't always 85% ethanol either. It will depend on your local/state laws on what E85 is. Example, some laws will say all they owe you in the fuel is 75% ethanol. GENERALLY though most E85 is above 100 octane equivalent.
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