Quote:
Originally Posted by 1stE53
That sounds good and all but when my Mercedes manual states "if there is no 91 or GREATER octane gas available, only put enough fuel in to get to the next station and fill the tank with 91" Mercedes can not possible know what gas station you are going to therefore is NOT bought off my the MAN (big oil  ). The other factor; here in MO only premium does not include that joke of a fuel we call Ethanol (corn based). If we were truly serious about ethanol, we would use sugar cane based, but that is for another time. 24% less efficient than regular petrol (fact). Now tell me premium doesn't matter. |
I agree with you on the ethanol issue, it is a sad state of affairs when we are using food crops to make our cars run more poorly.
In reference to your comment that premium doesn't matter, that isn't what the original poster asked. The question was whether 87 or 91 matters. I suggest that it often doesn't, but better fuel sometimes has more cleaning agents, and I agree with you that it sometimes doesn't have ethanol (the 94 AKI I purchased today had zero ethanol, unlike all the other fuels at that particular station). Both the cleaning agents and the reduced ethanol are reasons to choose more expensive fuels, which usually means fuels that have a higher AKI.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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