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I'll throw in another tidbit to consider: bump starting will use less energy overall, so all else being equal, it is better to bump start. If you use the starter, you have the losses of the starter motor itself (minimal) and the losses of using the alternator to replenish the charge on the battery, etc. which are somewhat greater. Bump starting has only some mechanical losses.
So, I bump start when I can (with less than about 15s of idling) or use the starter when I can sit for longer than ~15s.
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