In stop/go, crawling traffic, I will bump start as low as 20 mph. And anywhere that I sit still for at least 7 to 10 seconds, I will shut down and use the starter when it's time to move. I slow-moving traffic, I do like trucks and let a little extra space open up in front of me. I roll along slowly at 25 or 35 MPH pluse and gliding. Regularly see some of my most amazing FE numbers in the worst LA traffic.
But until you are much more comfortable with bump starting I would recommend not trying it below 20 mph or 3 rd gear much. It is harder to do gently at really slow speeds.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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