Quote:
Originally Posted by Cymaro
Hello,Has anyone else noticed that super unleaded gas with 10% ethanol is now 87 octane? That is the same octane as regular gas. I'm in IA and the 10% ethanol gas used to be 89. Anyone know of a reason for this?
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That sounds very low for super unleaded. The altitude of Ames Iowa is only about 1000 ft, so the air isn't going to be too much thinner than at sea level. The only other thing I can think of is that they aren't taking the ethanol into account when giving the octane rating (pure ethanol has an octane rating of 99). Even then, that wouldn't get it close to the octane that is normal for 'super' gasoline.