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The Beast has 10.4:1 compression.
In ye olde days that would mean 87 octane would be a no-go.
This is because a distributors couldn't retard the timing far enough to prevent detonation.
Now that electronically controlled ignition is here, there's no actual limit to how far the timing can go.
So the car is tuned to use 87 octane and it runs just fine on it.
It also has a table for E85, which it also runs just fine on.
Just for fun, I've been running 93 octane, despite not having a fuel table that will advance the timing to take advantage of the compression that's mechanically part of the engine.
It's "seat of the pants" smoother with more octane.
It will not show even a thousandth of a second improvement in the 1/4 mile.
It gets about 1.5 mpg better mileage, but that's because the smoother means I stay out the pedal more not because the engine is being inherently more efficient on higher octane.
I've paid for HP tuners. Supposedly you can add a 93 octane timing table and keep the ability to run 87. I know The Precious did.
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