Quote:
Shifting Operation
Depending on the driving situation, distinctions are made between trailing-throttle upshifts, trailing-throttle downshifts, acceleration upshifts and acceleration downshifts. The complete shifting operation takes place in 3 phases.
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Source: Getrag SMGII Technical Documentation
Full Throttle shifts are always guaranteed to make the fastest shift in the current situation possible. I think your instructor is wrong on that occasion.