Like 5302 mentioned, octane is added to fuel to resist burning, the higher the rating the higher the resistance to burning, it basically provides a more controlled burn. In diesel fuel they use a "cetane" rating which works the exact opposite of an octane rating. Just some useless knowledge I had to release.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542