Octane Mixing

[fireant911]

I have a very basic question for those familiar with petroleum products. Can one mix octanes similar to mixing of oil viscosities? Given the following scenario:

87 octane @ $2.69/gal
89 octane @ $2.79/gal
93 octane @ $2.89/gal

In order to save money and achieve the higher octane while having a larger volume can I purchase one gallon of 87 octane and one gallon of 93 octane to create a octane mixture of (87+93)/2 = 90 octane which will cost ($2.69+2.89)/2 = $2.79 gallon?

This is non Porsche related so please no comments about me being cheap (which I am) - I am simply curious if the octanes can mix in this fashion.

[island911]

I've read (on Pelican likely) that mixing the two actually produces slightly higher O-rating than the the average of the two.

Dont know if it's true.

[RickM]

Hmm, I've heard the opposite. Will have to research.......another time

[M.D. Holloway]

Mixing is not linier yet not truely exponential either. I did do some actual research years ago and found that increased octane did provide better milage but it was an exact wash aainst monies saved.

[kang]

Yes, octanes can be mixed. That's how they get the mid-grade stuff. Don't know that it will save you money, though.

Here's a chart for mixing race gas:

http://www.bazonkers.com/octanechart.htm