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  1. Proterra electric plug-in bus has a future

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    I was able to drive a Proterra all-electric public transit bus today in the mountains of Colorado. The bus was able to maintain 25 MPH up a 6% or 7% grade, burning about 20% of its charge in twenty-five minutes of mountain driving. On the level, it effortlessly reached 55 MPH. With a little...
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