Engines rev on start to overcome the higher internal friction of various components when the car is cold. The engine needs to build oil pressure as fast as possible. Not much wear unless under load, that is why they stall sometimes when you start and go asap. It's probably one of the worst things you could do to your engine. Emissions are horrible until cars are warmed up and the cats can do there job, engine can run leaner. If you want to go asap, go electric.
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