From my understanding you want to run as low as possible of octane fuel you can with out knocking. Lower octane burns hotter and faster, hence the reason it can create detonation in high compression engines or those that have been force inducted. To run a high octane fuel in an engine not designed for it can lead to carbon build up on the pistons and valves.
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2010 Ford 6.4L Power Stroke Diesel: 588whp/1082wtrq
2007 Dodge 6.7L Cummins Diesel: 788whp/1405wtrq, runs 12's @ 7400lbs, Still miss my 370z!
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