What are the short or long term negative results(if any) of using regular instead of super unleaded fuel in a NSX?

This is a confusing issue for me because the owners manual on my other vehicle(X5)states premium, but the dealer recommends regular unleaded.....
you will run the risk of detonating and causing engine damage by running 87 octane. The C30 or the C32 engines in the nsx have a compression ratio of over 10:1. What the octane rating basically means is the fuels resistance to pre igniting. What pre ignition is, is when the combustion happens too soon before top dead center of the compression stroke on the engine. This causes a shock wave or very powerful that is trying to force the piston down when the piston is trying to move up to the top of its travel.
This is why you will sometimes hear a rattling sound coming from peoples engine under a load, it sounds kinda like a broken ball bearing when this is happening. There is some kind of fail safe to prevent this, the engine has a sensor called a knock sensor, when this sensor picks up a frequency that is not considered to be normal, the engine will retard its ignition timing up to the max it is allowed to try to stop the engine from pre igniting. This will then effect your horsepower and fuel economy for the worse. The stock ECU on vehicles are smart enough to learn its engine parameters based on long term driver input. So if the engine see's crap gas or a very light footed driver for most of its life, the engine will perform like so. If you have a driver who is always reving it, and redlining the engine, the engine will always be used to making its max power and will produce more power or the power that its suppose to make.
Also another disadvantage of 87 octane fuel is that its not as clean so it will gum up your valves and clog your fuel injectors, while the 93 octane have detergents in it to keep your engine clean on the inside. The price difference more than makes up for it. Plus you don't run the risk of causing permanent damage to your engine, or have less power or have crappy fuel economy.
If your dealer is recommending that you run regular, I would not trust a word coming from there techs because obviously know very little about basic mechanics.