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I was thinking of ways to reduce waist of energy in the operation of car. The starter has quite a bit of weight. There was a period of time that my starter was broken and I had to drive to school. My brother and I would park at the far end of the parking lot. We would roll start it to get it running. At the house we parked it at the top of a slight rise. Roll start in the AM. The real problem was the Walk to and from the car. It was not convienyent. No one picked me up on the fact that most cars can not be started this way. No one suggested that a fold up bike could be used as a spare Tyre.
The problem of taking Rail to work is that there is that last mile. You might walk it.
For most folks we do not think of that.
I used to work on a TV Electronic New Gathering van. We had Two batteries. One did most of the work. However we had a second. That was only used to jump the first if it should be failing, and not do the start alone.
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