93 + 97 Octane = ?

[Taurus]

What happens if you mix up an unleaded gasoline with an Octane rating of 93+(SeaOil) and an Octane rating of 97 (SeaOil), considering that you fill up with the same number of liters?

20 l (93 Octane) + 20 l (97 Octane) = Average Octane rating?

[oj88]

6.15 Can I mix different octane fuel grades?

Yes, however attempts to blend in your fuel tank should be carefully planned. You should not allow the tank to become empty, and then add 50% of lower octane, followed by 50% of higher octane. The fuels may not completely mix immediately, especially if there is a density difference. You may get a slug of low octane that causes severe knock. You should refill when your tank is half full. In general the octane response will be linear for most hydrocarbon and oxygenated fuels eg 50:50 of 87 and 91 will give 89.

http://www.faqs.org/faqs/autos/gasol.../preamble.html

[niky]

If your engine drinks 93 with no problem... then there's no problem.