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- 2007 MS3
As far as rpms are concerned, I consider it all a matter of experience and feel. You should know when your engine is "lugging" or loaded too much in low rpms. If everything just goes smoothly with no feeling of the motor needing a second to get its wind, then you probably don`t need to worry about it, but if you step on it and instead of just taking off, the car kind of grunts, hesitates, then finally starts building the rpms, you should have downshifted.