I don't think Stealth was trying to be a smarta** - just saying unless you need more octane (engine pinging due to detonation), you are just paying more for a tank of gas.
Octane is merely a measure of a fuel's ability to resist pre-ignition or detonation.
A tune up is one of the most over-used excuses to rape a customer of money a shop can use. It used to consist of resetting or replacing points, condensors, wires, coil caps, plugs, lubing ignition rotor lobes, etc. Nowadays, with electronic ignitions, high-quality coils and wires, and cleaner burning engines, a tune up MAY consist of changing spark plugs. Just follow normal maintenance procedures and you'll be fine.
