4k under normal circumstances. I've tried shifting both higher and lower. Shifting below 3k is babying the car too much for my taste, there's no power there compared to higher revs. May as well be driving my beater. Higher than 5k, and you get a lot of vibration/noise that I'd like to avoid for normal, everyday driving.
I don't really look at the speedo/tach, I've just come to "feel" like that 4k mark is generally the sweet spot for my standard driving, and seems the most natural to me.
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