i've never seen any negative effects of occasional bump starting... i'm not sure how much it will save, that'll depend on a lot of factors... i find bumpstarting works best in 5th and 4th gear, i've even bumpstarted while i was coasting to a stop and the light turned green just before a was about to come to a standstill.
i think the forces experienced by the clutch is comparable or even lowever than when you shift gears or when you take of from standstill so i think think and abnormal wear wan resuly from a smooth bumpstart
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