93 Octain Gas

[*13*]

I remember hearing that unless you are using the 92/93 octane within a few weeks that it actually declines in octane. If your fuel is sitting in the tank any longer than this you may consider running the medium grade fuel. I'm not a chemist, this came from a meeting held by one of the local oil/fuel companies.
With the economy the way it has been, most people I know have stepped down a grade in their daily drivers. I would guess this is pretty common across the board.

[dcdoug]

Originally Posted by *13*

With the economy the way it has been, most people I know have stepped down a grade in their daily drivers. I would guess this is pretty common across the board.

Great way to do damage to a $5k-$10k+ engine to save $.15 a gallon.

[Gunner]

Originally Posted by dcdoug

Great way to do damage to a $5k-$10k+ engine to save $.15 a gallon.

Yep. Some engines (like my Honda) use knock sensors and adjust. Most higher-performance engines (like both my Volvos, and several others in the past few years) REQUIRE 91 or higher for sustained operation without damage.

If I only had $0.15 for every old fart who told me I was wasting money putting premium in these cars, I'd have a free tank of juice.