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Paul....you know me....just gathering data lots of data........I sneak in a tank of mid grade into the C2 once in a while....and.....well.....09 seems to be a nice number dont you think.....3lt, mxo, 89u, f55 ..a cruising vehicle for the Saint.....maybe...lips sealed...oh Rc8...only 490 hahahahahahahahahahah
I know this isn't answering the question, but might I suggest doing the math on how much a year you are actually going to save by skimping on gas? It might surprise you how little it is even as a daily driver.
I didn't spend the money to buy a new 2008 Corvette just to put something a "little bit cheaper" in it... If I can't afford the good stuff (high octane) then I need to buy another car and that my friends is not going to happen. Spend the few extra dollars...
The issue is not the price of high octane gasoline. The real issue is the price of gasoline.
Here's one for you penny pinchers. 87 octane @ $4/gal. 93 2 $4.20/gal.
1/2 & 1/2 = 90 octane @ $4.10. Save one dollar and sixty cents per tankful and not risk long term damage to your $50+K car.
The issue is not the price of high octane gasoline. The real issue is the price of gasoline.
Here's one for you penny pinchers. 87 octane @ $4/gal. 93 2 $4.20/gal.
1/2 & 1/2 = 90 octane @ $4.10. Save one dollar and sixty cents per tankful and not risk long term damage to your $50+K car.
Okay, what long term damage? The manual says 87 is fine. And your math may be correct, but octane is not measured that way and the effects are not what you describe.