GM still fine-tuning Trump's next presidential limo

Another batch of spy photographs taken near GM's proving grounds in Milford, Mich., show Cadillac One, the latest presidential limousine, undergoing development tests.

Elon Musk's following helps Tesla lead Twitter engagement among brands in April

Tesla Motor's anticipated electric semi truck helped the company grab first place in Twitter engagement among brands for April, according to ListenFirst Media.

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