The shift points vary depending on the inputs from the throttle position sensor, engine load (MAP sensor), and speed.

In practical terms, if you very gradually step on the gas, shift points are at a lower RPM... usually around 2,000 RPM to attain better FE. If you pressed deeply on the gas (aggressive driving), shift points are delayed until about 4,000-4,500 RPM so you can exploit the engine's power band on each gear.