E-10 and Octane
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Ethanol can and does increase octane. In Iowa, we have three octane grades: 87 octane regular, 89 octane with 10% ethanol, and 91 to 93 octane premium. I suspect the 89 octane is 87 octane with 10% ethanol.
If you see 87 octane with 10% ethanol, I think it's likely they started with 85 octane gasoline.
Dont worry, the number indicated on the pump is correct.
If you see 87 octane with 10% ethanol, I think it's likely they started with 85 octane gasoline.
Dont worry, the number indicated on the pump is correct.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Originally Posted by nhpeterson
Since Ethanol is used in regular gas now, does that mean the Octane level needs to be adjusted? Would ethanol increase the octane?
Steve
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