Which gear to use depends on the engine (compression ratio), transmission (gear ratio), and how much traction you have. A hi-comp engine, in first gear, on gravel will probably just slide the tires across the top of the gravel and the engine won't spin.
I used second or third gear for push starting, but it's been many years since I needed to push start a vehicle and there were few transmissions with more than four gears back then.
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