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Originally Posted by RRC
In my case (no turbo) and old engine difference between lower and higher octane is about 0.5L/100km when we are talking about FE.
So yes the permium gas gives me a little bit better FE.
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That's a nice improvement.
3 times what I'm getting with premium diesel.
At that kind of difference, it starts paying off to use the premium fuel.
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The best what you can do is check it by self with your car.
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Obviously
