Claus, what is the alcohol type and content of your pump gas? Does your fuel contain oxygenates, and if so, what kind and how much?
Fuel quality makes a big difference in performance, and the gas sold here in the U.S. is pretty much garbage. New cars will deal with it; old cars don't.
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I have no idea I have to admit.
-However I could easily tell good gas from bad when I was driving the 11.3 compression engine.
But there is difference in octane rating in europe vs. the u.s. ..
-Check it out: In most countries (including all of Europe and Australia) the "headline" octane that would be shown on the pump is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, this means that the octane in the United States will be about 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, would be 91-92 in Europe. However most European pumps deliver 95 (RON) as "regular", equivalent to 90-91 US (R+M)/2, and even deliver 98 (RON) or 100 (RON).
