I'm everyone's been asked this question at least once. But seeing as how most engines made in the past decade are engineered to take both even though a lot of them recommend using only premium. So whats your 2 cents about about this topic?
I just put Midgrade into my 08 porsche cayenne. Does anybody know what grade I'm really supposed to put in it? I don't have a book . Also what should I do to fix the situation if I'm supposed to put premium in it?I run 100% non-ethanol gas in mine. Running regular or mid grade will cause the engine to retard timing thus reduced power.