I always shift in to the highest reasonable gear, going about 3-4mph down my driveway I put it in 3rd, going over 10mph I put it in 5th gear, letting a teenager drive your car for a week will more then likely cause more wear to your clutch then a year of smooth bump starting it would, I figure if it's enough of a jolt that my passenger noticed something happen then it was to rough.
The clutch slips a lot when you are getting a 2,000+ pound car moving from a dead stop, turning the engine over requires about 2 hp, less if it's already warmed up.
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