I just go by my tach. I can also usually hear/feel the engine, and if it want to shift then I shift. Its not always the same way either. If you are going from a level road up a step hill in fourth, eventually you are going to stall.
but yeah, all cars are different. I noticed that a lot of automatics like to shift somewhere around 4000 rpm. So thats usually the max I'll let each gear get to. I typically shift before that though, sometimes around 2500-3000. If racing or just feeling like a gearhead for no reason, then I'll go to 5000-6000 sometimes.
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