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Once again I fail to see how it saves fuel.
lets say I'm driving and its time to up shift from second to third. I start out with the engine at a high rpm. After I shift, my engine is at a lower rpm.
Shifting with the clutch I take some of the high rpm rotational energy and, even though the clutch slips some, use it to generate torque to move the car forward. The rest of the energy gets turned to heat.
Shifting with out the clutch I pop it out of gear at a high rpm and let the engine spin down (wasting energy that could be used) until the syncros line up and pop it into the next gear.
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