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In my saturn Sl1, i shift between 2000-2300, because thats where the BSFC curve peaks. I have a vacuum gauge installed and accelerate at approximately 2-4 mmHg vacuum (which equals to about 75% load). I've seen a noticeable improvement by doing this.
As others have said, the object is to keep your motor within its most efficient operating range when you need to accelerate. With most engines, the most efficient point is around 75% load and at the rpm range where peak torque is produced. Once you reach cruising speed, you should be in the highest gear. If you want to P&G, you should be in that operating range explained above for the pulse cycle.... and gear will vary depending on your speed.
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