Tesla is piling up promises, from the Semi truck to a new Roadster to fully ramped Model 3 production.
The company has a long history of overpromising and underdelivering.
That's been acceptable until now, but in 2018 Tesla needs to make good on consumer and investor expectations.
Tesla's biggest promise is a good one: accelerate humanity's exit from the fossil-fuel era. Its second-biggest promise is also pretty big: be the first successful new American car company in...
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