[quote=zeoth]I think we are talking about the same thing except when you said "it is simply a unit of measure" that's not quite true.[/quote
In my original post I stated it correctly by saying " Octane value is a measure..." and the following post referring to this as being a unit of measure i see can be misleading. ( I may have had a leak in my head gasket but i think it's fixed - ha ha)
To qualify that point ; some suppliers of fuel may not have octane at all rather other chemical combinations to simulate the characteristics of octane. In which, they have to comply with the octane rating spec. to sell their fuel, this where the " unit of measure " comes into play.
