Quote:
Originally Posted by david in germany
If you believe this than you really don't onderstand the concept of octane.
You should run the lowest octane your car is rated for ( the exception is cars running a tune with the need of a higher octane than the manufacturer recommends)
Using my non turbo 118i as an example.
Until Germany introduced E5 super I would regularly use E0 91 octane in my e87 and average 36-37 mpg showing my car is running efficiently. They have since added (mandated) E5 as super and you can only find Super plus (95 octane) without ethanol. I have been rewarded with a drop to 33-34 mpg since the change. The lower the octane the more volatile the fuel is (lower detonation point) Higher octane is more resistant to detonation. Non tuned cars can make more power on lower octane fuels.
Boosted cars are another ball game.
If you are not highly tuned (including bmw ppk)stick with 91.
Big tune, run a 93-95 or what the tuner recommends.
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I'm sure I don't understand the concept of octane, but see the smiling face in my post above? It means I'm having some fun.
I do have a tune, It's not super-powerful or anything, but still a tune. check my sig.
BTW, thanks for edumacating me.
