Hi rpm shifting will only be harmful for the engine and your gasoline consumption will suffer quite a bit. I've driven clutch since 1968 and have never abused the clutch. At the same time I don't baby the cars either. I shift depending on traffic conditions, if traffic is moving briskly I open my shifting at higher rpms than if traffic is slow, there I shift on lower end. I will still go through all the gears if traffic is moving above 30 mph.
