When driving a manual transmission new production car. What effect dose double clutching with rev matching have on the transmission and clutch when columbined with heel and toe down shifting. I want to know if these techniques help or hurt the respective components of the car. I can perform theses techniques correctly. It seems to me that if you doulble clutch you will ware out the clutch faster as you are simply using it more per each shift. If simply resting your foot on the clutch how ever lightly (note I do not do this ) can ware out the clutch. Why wouldn’t just proper rev matching help more than double clutching?