Regardless of a car I'm driving, I always shift at the peak torque for the car (car "tells" me when to shift). Usually it's 500 - 1000 rpms before redline

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1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"