[sionnsar]

Price should have nothing to do with the buyer's decision.

Huh? (I was tempted to say "central planning perhaps" but I know that's not what you're implying... *\;-)

But price would follow perceived value, whether true or not.

[Dog Gone]

All I'm saying is that you need the grade that you need. Buying a higher grade than you need accomplishes nothing but emptying your wallet. Buying a grade below what you need will hurt your engine.

Price is irrelevant to making the decision of which grade you need for your vehicle. It is what it is.