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I also have an 01M, I average 38mpg and have hit 41 once.
As mentioned, my car according to VCDS idles at 903 rpm and consumes 0.4l/hour at idle. My tires are set to 44 psi, I do not drive it easy nor do I coast, but when I am concious of mpg I do notice an increase.
I have changed my Injection Quantity and slightly advanced my timimg to achieve better mpg's overall.
You will not be able to change your IQ due to the fact you do not have a mechanical injection pump, but definatley get your timing checked
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